Experiment - monomorphic node/type/signature

[Titian Cernicova-Dragomir (dragomirtitian)]

Experiment to make several objects monomorphic by keeping the common properties in a single object shape and moving all other properties to a separate object and using accessors to preserve compatibility with existing code.

Local improvements seem promising, building TSC/compiler: -20% in time with +10% in memory (See bellow for results)

Code is rough around the edges, just testing out as a proof of concept.

Note: This is the result of me and Ashley Claymore (@acutmore) bouncing ideas about improving access to Node.kind

Update

On Node, the improvements with everything in this PR are:

• a total time win of 16.0% (ranging 10.5% to 23.7%)
• a checker time win of 20.8% (ranging 16.6% to 26.8%)
• a memory cost of 2.7% (ranging 1.9% to 4.4%)

Which is an exchange rate of 5.8 on total time, and 7.6 on checker time.

Breaking down where the performance win comes from (from the separate PRs):

AST Node monomorphism:

• total time win: 3.3% - 9%
• Check Time win: 3.7% - 11%
• Mem cost: ~0-1%

Types monomorphism:

• total time win: 4.1% - 20%
• Check Time win: 5.3% - 22.5%
• Mem cost: 0.75%-1.2%

Signatures monomorphism:

• total time win: 0.45% - 1.72%
• Check Time win: 0.56% - 2.04%
• Mem cost: ~0%

The AST nodes win is smaller than I remember in the first experiments. This is probably due to the reduction in memory which meant some relatively common properties are now in data not in Node.

[Jake Bailey (jakebailey)]

TypeScript Bot (@typescript-bot) perf test this

[TypeScript Bot (typescript-bot)]

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
perf test this	✅ Started	👀 Results

[TypeScript Bot (typescript-bot)]

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-Unions - node (v18.15.0, x64)
Errors	30	30	~	~	~	p=1.000 n=6
Symbols	62,153	62,153	~	~	~	p=1.000 n=6
Types	50,242	50,242	~	~	~	p=1.000 n=6
Memory used	194,582k (± 0.91%)	217,957k (± 0.03%)	🔻+23,375k (+12.01%)	217,873k	218,049k	p=0.005 n=6
Parse Time	1.57s (± 0.33%)	1.67s (± 0.49%)	🔻+0.09s (+ 5.93%)	1.66s	1.68s	p=0.004 n=6
Bind Time	0.86s (± 1.55%)	0.81s (± 1.04%)	🟩-0.05s (- 6.21%)	0.80s	0.82s	p=0.004 n=6
Check Time	11.20s (± 0.36%)	8.67s (± 0.93%)	🟩-2.53s (-22.60%)	8.57s	8.78s	p=0.005 n=6
Emit Time	3.26s (± 0.69%)	2.87s (± 0.51%)	🟩-0.39s (-12.10%)	2.85s	2.89s	p=0.005 n=6
Total Time	16.89s (± 0.29%)	14.01s (± 0.59%)	🟩-2.88s (-17.07%)	13.92s	14.14s	p=0.005 n=6
angular-1 - node (v18.15.0, x64)
Errors	5	5	~	~	~	p=1.000 n=6
Symbols	944,114	944,114	~	~	~	p=1.000 n=6
Types	407,051	407,051	~	~	~	p=1.000 n=6
Memory used	1,218,316k (± 0.00%)	1,387,661k (± 0.00%)	🔻+169,345k (+13.90%)	1,387,617k	1,387,712k	p=0.005 n=6
Parse Time	7.96s (± 0.46%)	8.42s (± 0.48%)	🔻+0.46s (+ 5.76%)	8.37s	8.49s	p=0.005 n=6
Bind Time	2.23s (± 0.63%)	1.91s (± 0.39%)	🟩-0.32s (-14.28%)	1.90s	1.92s	p=0.005 n=6
Check Time	35.82s (± 0.40%)	27.74s (± 0.22%)	🟩-8.07s (-22.54%)	27.63s	27.81s	p=0.005 n=6
Emit Time	16.18s (± 0.53%)	14.05s (± 0.29%)	🟩-2.12s (-13.12%)	14.01s	14.12s	p=0.005 n=6
Total Time	62.18s (± 0.26%)	52.13s (± 0.17%)	🟩-10.05s (-16.17%)	51.97s	52.21s	p=0.005 n=6
mui-docs - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,133,539	2,133,539	~	~	~	p=1.000 n=6
Types	926,551	926,551	~	~	~	p=1.000 n=6
Memory used	2,115,789k (± 0.01%)	2,268,208k (± 0.00%)	🔻+152,419k (+ 7.20%)	2,268,182k	2,268,228k	p=0.005 n=6
Parse Time	7.88s (± 0.23%)	9.27s (± 0.28%)	🔻+1.39s (+17.64%)	9.24s	9.31s	p=0.005 n=6
Bind Time	2.74s (± 0.38%)	2.01s (± 0.87%)	🟩-0.74s (-26.85%)	1.99s	2.04s	p=0.004 n=6
Check Time	84.05s (± 0.27%)	61.65s (± 0.24%)	🟩-22.40s (-26.65%)	61.46s	61.80s	p=0.005 n=6
Emit Time	0.16s (± 3.95%)	0.17s (± 3.32%)	~	0.16s	0.17s	p=0.201 n=6
Total Time	94.84s (± 0.25%)	73.09s (± 0.20%)	🟩-21.74s (-22.93%)	72.91s	73.21s	p=0.005 n=6
self-build-src - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,230,761	1,240,272	+9,511 (+ 0.77%)	~	~	p=0.001 n=6
Types	261,189	261,013	-176 (- 0.07%)	~	~	p=0.001 n=6
Memory used	2,356,206k (± 1.03%)	2,678,211k (± 0.01%)	🔻+322,005k (+13.67%)	2,677,639k	2,678,592k	p=0.005 n=6
Parse Time	5.97s (± 0.40%)	6.43s (± 0.99%)	🔻+0.46s (+ 7.65%)	6.37s	6.52s	p=0.005 n=6
Bind Time	2.26s (± 1.02%)	2.03s (± 0.96%)	🟩-0.23s (-10.32%)	2.01s	2.06s	p=0.005 n=6
Check Time	39.74s (± 0.61%)	32.39s (± 0.18%)	🟩-7.36s (-18.51%)	32.33s	32.45s	p=0.005 n=6
Emit Time	3.15s (± 4.19%)	3.08s (± 0.87%)	~	3.03s	3.11s	p=0.470 n=6
Total Time	51.12s (± 0.68%)	43.93s (± 0.21%)	🟩-7.19s (-14.06%)	43.83s	44.04s	p=0.005 n=6
self-build-src-public-api - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,230,761	1,240,272	+9,511 (+ 0.77%)	~	~	p=0.001 n=6
Types	261,189	261,013	-176 (- 0.07%)	~	~	p=0.001 n=6
Memory used	2,432,527k (± 0.98%)	2,764,869k (± 0.02%)	🔻+332,342k (+13.66%)	2,764,038k	2,765,515k	p=0.005 n=6
Parse Time	6.20s (± 0.57%)	6.54s (± 0.83%)	🔻+0.34s (+ 5.43%)	6.45s	6.60s	p=0.005 n=6
Bind Time	2.03s (± 1.22%)	2.03s (± 0.51%)	~	2.01s	2.04s	p=1.000 n=6
Check Time	40.03s (± 0.32%)	32.37s (± 0.20%)	🟩-7.66s (-19.13%)	32.29s	32.45s	p=0.005 n=6
Emit Time	3.22s (± 3.43%)	3.08s (± 2.76%)	🟩-0.14s (- 4.29%)	3.00s	3.21s	p=0.031 n=6
Total Time	51.50s (± 0.30%)	44.04s (± 0.29%)	🟩-7.46s (-14.49%)	43.86s	44.18s	p=0.005 n=6
self-compiler - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	258,573	259,522	+949 (+ 0.37%)	~	~	p=0.001 n=6
Types	104,819	104,829	+10 (+ 0.01%)	~	~	p=0.001 n=6
Memory used	428,188k (± 0.00%)	495,625k (± 0.02%)	🔻+67,437k (+15.75%)	495,502k	495,768k	p=0.005 n=6
Parse Time	4.11s (± 0.70%)	4.27s (± 0.67%)	🔻+0.17s (+ 4.02%)	4.24s	4.32s	p=0.005 n=6
Bind Time	1.63s (± 0.32%)	1.48s (± 0.35%)	🟩-0.14s (- 8.81%)	1.48s	1.49s	p=0.004 n=6
Check Time	21.92s (± 0.29%)	17.01s (± 0.45%)	🟩-4.91s (-22.41%)	16.87s	17.07s	p=0.005 n=6
Emit Time	1.72s (± 1.63%)	1.68s (± 1.23%)	-0.04s (- 2.22%)	1.65s	1.71s	p=0.029 n=6
Total Time	29.38s (± 0.21%)	24.44s (± 0.40%)	🟩-4.94s (-16.80%)	24.27s	24.51s	p=0.005 n=6
ts-pre-modules - node (v18.15.0, x64)
Errors	35	35	~	~	~	p=1.000 n=6
Symbols	224,565	224,565	~	~	~	p=1.000 n=6
Types	93,734	93,734	~	~	~	p=1.000 n=6
Memory used	369,444k (± 0.02%)	425,551k (± 0.01%)	🔻+56,107k (+15.19%)	425,509k	425,599k	p=0.005 n=6
Parse Time	2.76s (± 1.11%)	3.12s (± 0.98%)	🔻+0.36s (+12.96%)	3.09s	3.17s	p=0.005 n=6
Bind Time	1.58s (± 0.87%)	1.29s (± 0.40%)	🟩-0.30s (-18.82%)	1.28s	1.29s	p=0.004 n=6
Check Time	15.45s (± 0.44%)	12.30s (± 0.34%)	🟩-3.15s (-20.40%)	12.25s	12.37s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	19.81s (± 0.39%)	16.71s (± 0.36%)	🟩-3.10s (-15.64%)	16.65s	16.82s	p=0.005 n=6
vscode - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=NaN n=0
Symbols	0	0	~	~	~	p=NaN n=0
Types	0	0	~	~	~	p=NaN n=0
Memory used	0k	0k	~	~	~	p=NaN n=0
Parse Time	0s	0s	~	~	~	p=NaN n=0
Bind Time	0s	0s	~	~	~	p=NaN n=0
Check Time	0s	0s	~	~	~	p=NaN n=0
Emit Time	0s	0s	~	~	~	p=NaN n=0
Total Time	0s	0s	~	~	~	p=NaN n=0
webpack - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	266,926	266,926	~	~	~	p=1.000 n=6
Types	108,691	108,691	~	~	~	p=1.000 n=6
Memory used	411,270k (± 0.01%)	464,212k (± 0.01%)	🔻+52,942k (+12.87%)	464,168k	464,328k	p=0.005 n=6
Parse Time	3.78s (± 0.22%)	3.82s (± 0.67%)	+0.04s (+ 1.10%)	3.78s	3.86s	p=0.010 n=6
Bind Time	1.68s (± 0.31%)	1.53s (± 0.55%)	🟩-0.15s (- 9.05%)	1.51s	1.53s	p=0.004 n=6
Check Time	16.77s (± 0.29%)	14.04s (± 0.20%)	🟩-2.73s (-16.28%)	14.00s	14.07s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	22.22s (± 0.20%)	19.38s (± 0.24%)	🟩-2.84s (-12.78%)	19.33s	19.46s	p=0.005 n=6
xstate-main - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	523,765	523,765	~	~	~	p=1.000 n=6
Types	178,055	178,055	~	~	~	p=1.000 n=6
Memory used	461,853k (± 0.09%)	509,764k (± 0.07%)	🔻+47,911k (+10.37%)	509,413k	510,186k	p=0.005 n=6
Parse Time	2.64s (± 0.57%)	2.90s (± 0.84%)	🔻+0.26s (+10.06%)	2.87s	2.94s	p=0.005 n=6
Bind Time	0.98s (± 0.56%)	0.85s (± 0.48%)	🟩-0.13s (-13.54%)	0.85s	0.86s	p=0.003 n=6
Check Time	15.18s (± 0.41%)	13.04s (± 0.29%)	🟩-2.14s (-14.07%)	12.99s	13.10s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	18.80s (± 0.35%)	16.79s (± 0.30%)	🟩-2.01s (-10.68%)	16.73s	16.86s	p=0.005 n=6

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• Compiler-Unions - node (v18.15.0, x64)
• angular-1 - node (v18.15.0, x64)
• mui-docs - node (v18.15.0, x64)
• self-build-src - node (v18.15.0, x64)
• self-build-src-public-api - node (v18.15.0, x64)
• self-compiler - node (v18.15.0, x64)
• ts-pre-modules - node (v18.15.0, x64)
• vscode - node (v18.15.0, x64)
• webpack - node (v18.15.0, x64)
• xstate-main - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

tsserver

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-UnionsTSServer - node (v18.15.0, x64)
Req 1 - updateOpen	2,279ms (± 0.67%)	2,330ms (± 0.82%)	+50ms (+ 2.21%)	2,293ms	2,349ms	p=0.008 n=6
Req 2 - geterr	5,069ms (± 0.77%)	4,282ms (± 1.34%)	🟩-787ms (-15.52%)	4,166ms	4,314ms	p=0.005 n=6
Req 3 - references	265ms (± 0.37%)	267ms (± 0.70%)	~	265ms	270ms	p=0.082 n=6
Req 4 - navto	227ms (± 1.08%)	227ms (± 0.77%)	~	224ms	229ms	p=0.493 n=6
Req 5 - completionInfo count	1,357	1,357	~	~	~	p=1.000 n=6
Req 5 - completionInfo	90ms (± 3.06%)	84ms (± 7.70%)	~	75ms	92ms	p=0.165 n=6
CompilerTSServer - node (v18.15.0, x64)
Req 1 - updateOpen	2,394ms (± 0.46%)	2,505ms (± 1.16%)	🔻+111ms (+ 4.65%)	2,462ms	2,546ms	p=0.005 n=6
Req 2 - geterr	3,791ms (± 0.28%)	3,283ms (± 3.01%)	🟩-509ms (-13.42%)	3,189ms	3,385ms	p=0.005 n=6
Req 3 - references	275ms (± 0.15%)	303ms (±10.57%)	🔻+28ms (+ 9.99%)	281ms	345ms	p=0.004 n=6
Req 4 - navto	227ms (± 0.23%)	230ms (± 2.71%)	~	226ms	242ms	p=0.242 n=6
Req 5 - completionInfo count	1,519	1,519	~	~	~	p=1.000 n=6
Req 5 - completionInfo	69ms (± 0.75%)	73ms (±10.64%)	~	65ms	82ms	p=0.367 n=6
xstate-main-1-tsserver - node (v18.15.0, x64)
Req 1 - updateOpen	5,189ms (± 0.44%)	5,435ms (± 0.33%)	🔻+246ms (+ 4.73%)	5,412ms	5,462ms	p=0.005 n=6
Req 2 - geterr	1,123ms (± 0.98%)	985ms (± 0.63%)	🟩-138ms (-12.33%)	978ms	994ms	p=0.005 n=6
Req 3 - references	76ms (± 0.99%)	88ms (± 4.72%)	🔻+12ms (+15.38%)	83ms	95ms	p=0.004 n=6
Req 4 - navto	451ms (± 1.02%)	331ms (± 0.76%)	🟩-120ms (-26.63%)	328ms	335ms	p=0.005 n=6
Req 5 - completionInfo count	3,413	3,413	~	~	~	p=1.000 n=6
Req 5 - completionInfo	837ms (± 1.47%)	816ms (± 2.39%)	~	801ms	854ms	p=0.065 n=6

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• CompilerTSServer - node (v18.15.0, x64)
• Compiler-UnionsTSServer - node (v18.15.0, x64)
• xstate-main-1-tsserver - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

startup

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
tsc-startup - node (v18.15.0, x64)
Execution time	157.49ms (± 0.16%)	159.01ms (± 0.19%)	+1.52ms (+ 0.97%)	157.99ms	164.16ms	p=0.000 n=600
tsserver-startup - node (v18.15.0, x64)
Execution time	241.31ms (± 0.13%)	234.00ms (± 0.15%)	🟩-7.31ms (- 3.03%)	232.43ms	240.65ms	p=0.000 n=600
tsserverlibrary-startup - node (v18.15.0, x64)
Execution time	236.15ms (± 0.15%)	228.82ms (± 0.16%)	🟩-7.33ms (- 3.11%)	227.29ms	235.52ms	p=0.000 n=600
typescript-startup - node (v18.15.0, x64)
Execution time	236.21ms (± 0.14%)	228.64ms (± 0.16%)	🟩-7.57ms (- 3.21%)	227.36ms	233.70ms	p=0.000 n=600

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• tsc-startup - node (v18.15.0, x64)
• tsserver-startup - node (v18.15.0, x64)
• tsserverlibrary-startup - node (v18.15.0, x64)
• typescript-startup - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

Developer Information:

Download Benchmarks

[Mateusz Burzyński (Andarist)]

This is the most green thing I've seen this week. Nice!!

[michaelm (MichaelMitchell-at)]

Unfortunately I didn't see a noticeable perf improvement in the Airtable code base, but did see a 5-10% increase in peak memory usage.

[Titian Cernicova-Dragomir (dragomirtitian)]

Unfortunately I didn't see a noticeable perf improvement in the Airtable code base, but did see a 5-10% increase in peak memory usage.

michaelm (@MichaelMitchell-at) i find this a bit surprising. While the % of difference varies, we've generally noticed improvements across the board. Is this a public repo? If it not, could you run the tsc on this branch through dexnode to get a report for the inline caches?

Also how did you measure the times? What is the output with - - diagnostics?

[michaelm (MichaelMitchell-at)]

Unfortunately I didn't see a noticeable perf improvement in the Airtable code base, but did see a 5-10% increase in peak memory usage.

michaelm (@MichaelMitchell-at) i find this a bit surprising. While the % of difference varies, we've generally noticed improvements across the board. Is this a public repo? If it not, could you run the tsc on this branch through dexnode to get a report for the inline caches?

Also how did you measure the times? What is the output with - - diagnostics?

Actually there seems to be an error with my methodology so throw out the previous result I mentioned. I can't seem to apply the patch cleanly at the moment. I'll just have to wait for this to reach nightly.

[michaelm (MichaelMitchell-at)]

Ok, I looked into it a bit more. Our custom runner uses the compiler API and that code path hasn't been updated to support the new node structure yet.

> const ts = require('./lib/typescript.js')
> ts.readConfigFile('src/tsconfig.json', ts.sys.readFile)
Uncaught Error: Debug Failure. False expression.
at parseUpdateExpression (TypeScript/lib/typescript.js:37704:11)
at parseUnaryExpressionOrHigher (/TypeScript/lib/typescript.js:37622:32)
at parseBinaryExpressionOrHigher (TypeScript/lib/typescript.js:37544:25)
at parseAssignmentExpressionOrHigher (TypeScript/lib/typescript.js:37215:18)

I should be able to get past this if I can swap out this part with a lib that can parse JSON with comments and trailing commas.

Edit: ts.transpileDeclaration has the same problem, so I just tried comparing build times without leveraging isolated declarations. Performance still seems about the same or even worse overall, particularly on smaller projects, < 10s to build. I'm running these in our CI pipeline for more consistent results. Anyway, I think I should just wait for this PR to be ready to preview and can try it out again then.

[Jake Bailey (jakebailey)]

TypeScript Bot (@typescript-bot) perf test this

[TypeScript Bot (typescript-bot)]

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
perf test this	✅ Started	👀 Results

[TypeScript Bot (typescript-bot)]

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-Unions - node (v18.15.0, x64)
Errors	30	30	~	~	~	p=1.000 n=6
Symbols	62,153	62,153	~	~	~	p=1.000 n=6
Types	50,242	50,242	~	~	~	p=1.000 n=6
Memory used	192,880k (± 0.74%)	218,478k (± 0.63%)	🔻+25,599k (+13.27%)	217,750k	221,281k	p=0.005 n=6
Parse Time	1.57s (± 0.52%)	1.63s (± 0.92%)	+0.05s (+ 3.39%)	1.60s	1.64s	p=0.005 n=6
Bind Time	0.85s (± 0.98%)	0.81s (± 1.00%)	🟩-0.04s (- 4.87%)	0.80s	0.82s	p=0.004 n=6
Check Time	11.20s (± 0.56%)	8.59s (± 1.04%)	🟩-2.61s (-23.30%)	8.47s	8.71s	p=0.005 n=6
Emit Time	3.30s (± 1.09%)	2.81s (± 0.27%)	🟩-0.49s (-14.75%)	2.80s	2.82s	p=0.005 n=6
Total Time	16.93s (± 0.36%)	13.84s (± 0.66%)	🟩-3.09s (-18.26%)	13.73s	13.96s	p=0.005 n=6
angular-1 - node (v18.15.0, x64)
Errors	5	5	~	~	~	p=1.000 n=6
Symbols	944,114	944,114	~	~	~	p=1.000 n=6
Types	407,051	407,051	~	~	~	p=1.000 n=6
Memory used	1,218,304k (± 0.00%)	1,387,391k (± 0.00%)	🔻+169,088k (+13.88%)	1,387,359k	1,387,431k	p=0.005 n=6
Parse Time	7.98s (± 0.55%)	8.05s (± 0.50%)	+0.08s (+ 0.98%)	7.99s	8.10s	p=0.024 n=6
Bind Time	2.22s (± 0.53%)	1.91s (± 0.51%)	🟩-0.31s (-13.82%)	1.90s	1.92s	p=0.005 n=6
Check Time	35.68s (± 0.55%)	27.28s (± 0.32%)	🟩-8.40s (-23.55%)	27.16s	27.40s	p=0.005 n=6
Emit Time	16.02s (± 0.80%)	13.85s (± 0.49%)	🟩-2.17s (-13.52%)	13.79s	13.98s	p=0.005 n=6
Total Time	61.89s (± 0.28%)	51.10s (± 0.16%)	🟩-10.80s (-17.44%)	51.02s	51.20s	p=0.005 n=6
mui-docs - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,134,511	2,134,511	~	~	~	p=1.000 n=6
Types	927,068	927,068	~	~	~	p=1.000 n=6
Memory used	2,115,981k (± 0.01%)	2,268,286k (± 0.00%)	🔻+152,305k (+ 7.20%)	2,268,243k	2,268,330k	p=0.005 n=6
Parse Time	7.85s (± 0.47%)	8.97s (± 0.57%)	🔻+1.12s (+14.26%)	8.92s	9.05s	p=0.005 n=6
Bind Time	2.76s (± 0.81%)	2.04s (± 0.78%)	🟩-0.72s (-25.98%)	2.03s	2.07s	p=0.005 n=6
Check Time	83.64s (± 0.46%)	60.66s (± 0.47%)	🟩-22.98s (-27.48%)	60.36s	61.18s	p=0.005 n=6
Emit Time	0.16s (± 4.75%)	0.16s (± 3.16%)	~	0.16s	0.17s	p=0.241 n=6
Total Time	94.41s (± 0.41%)	71.83s (± 0.36%)	🟩-22.58s (-23.91%)	71.60s	72.31s	p=0.005 n=6
self-build-src - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,230,804	1,246,592	+15,788 (+ 1.28%)	~	~	p=0.001 n=6
Types	261,202	263,541	+2,339 (+ 0.90%)	~	~	p=0.001 n=6
Memory used	2,345,838k (± 0.05%)	2,680,576k (± 0.01%)	🔻+334,738k (+14.27%)	2,680,221k	2,681,092k	p=0.005 n=6
Parse Time	6.01s (± 0.40%)	6.19s (± 0.94%)	+0.17s (+ 2.88%)	6.10s	6.27s	p=0.005 n=6
Bind Time	2.26s (± 0.90%)	2.06s (± 1.14%)	🟩-0.20s (- 9.06%)	2.02s	2.09s	p=0.005 n=6
Check Time	39.77s (± 0.39%)	31.89s (± 0.43%)	🟩-7.89s (-19.83%)	31.68s	32.05s	p=0.005 n=6
Emit Time	3.24s (± 5.62%)	3.07s (± 1.40%)	🟩-0.17s (- 5.24%)	3.03s	3.14s	p=0.037 n=6
Total Time	51.30s (± 0.24%)	43.20s (± 0.48%)	🟩-8.09s (-15.78%)	42.96s	43.54s	p=0.005 n=6
self-build-src-public-api - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,230,804	1,246,592	+15,788 (+ 1.28%)	~	~	p=0.001 n=6
Types	261,202	263,541	+2,339 (+ 0.90%)	~	~	p=0.001 n=6
Memory used	2,422,778k (± 0.01%)	2,777,844k (± 0.97%)	🔻+355,066k (+14.66%)	2,765,961k	2,832,701k	p=0.005 n=6
Parse Time	6.18s (± 0.77%)	6.35s (± 0.89%)	+0.17s (+ 2.81%)	6.29s	6.44s	p=0.005 n=6
Bind Time	2.02s (± 0.40%)	2.04s (± 0.40%)	+0.03s (+ 1.32%)	2.03s	2.05s	p=0.006 n=6
Check Time	40.12s (± 0.14%)	31.84s (± 0.39%)	🟩-8.29s (-20.65%)	31.60s	31.92s	p=0.005 n=6
Emit Time	3.19s (± 1.81%)	3.12s (± 2.29%)	~	3.06s	3.24s	p=0.108 n=6
Total Time	51.51s (± 0.26%)	43.36s (± 0.32%)	🟩-8.15s (-15.83%)	43.11s	43.48s	p=0.005 n=6
self-compiler - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	258,574	265,812	+7,238 (+ 2.80%)	~	~	p=0.001 n=6
Types	104,825	107,348	+2,523 (+ 2.41%)	~	~	p=0.001 n=6
Memory used	428,178k (± 0.01%)	499,567k (± 0.01%)	🔻+71,389k (+16.67%)	499,538k	499,615k	p=0.005 n=6
Parse Time	4.08s (± 0.34%)	4.17s (± 1.06%)	+0.09s (+ 2.12%)	4.11s	4.24s	p=0.005 n=6
Bind Time	1.60s (± 0.83%)	1.49s (± 0.69%)	🟩-0.10s (- 6.57%)	1.48s	1.51s	p=0.004 n=6
Check Time	21.94s (± 0.38%)	16.74s (± 0.48%)	🟩-5.19s (-23.67%)	16.64s	16.84s	p=0.005 n=6
Emit Time	1.69s (± 1.45%)	1.67s (± 1.58%)	~	1.65s	1.72s	p=0.062 n=6
Total Time	29.31s (± 0.29%)	24.08s (± 0.51%)	🟩-5.23s (-17.85%)	23.92s	24.24s	p=0.005 n=6
ts-pre-modules - node (v18.15.0, x64)
Errors	35	35	~	~	~	p=1.000 n=6
Symbols	224,565	224,565	~	~	~	p=1.000 n=6
Types	93,734	93,734	~	~	~	p=1.000 n=6
Memory used	369,562k (± 0.05%)	425,386k (± 0.02%)	🔻+55,825k (+15.11%)	425,266k	425,443k	p=0.005 n=6
Parse Time	2.77s (± 1.29%)	3.00s (± 1.32%)	🔻+0.23s (+ 8.24%)	2.95s	3.05s	p=0.005 n=6
Bind Time	1.58s (± 0.65%)	1.28s (± 0.81%)	🟩-0.31s (-19.37%)	1.26s	1.29s	p=0.004 n=6
Check Time	15.47s (± 0.23%)	11.99s (± 0.35%)	🟩-3.48s (-22.50%)	11.91s	12.03s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	19.83s (± 0.25%)	16.27s (± 0.31%)	🟩-3.56s (-17.96%)	16.20s	16.33s	p=0.005 n=6
vscode - node (v18.15.0, x64)
Errors	139	139	~	~	~	p=1.000 n=6
Symbols	2,854,562	2,854,562	~	~	~	p=1.000 n=6
Types	976,042	976,042	~	~	~	p=1.000 n=6
Memory used	3,045,619k (± 0.00%)	3,455,715k (± 0.01%)	🔻+410,097k (+13.47%)	3,455,517k	3,456,128k	p=0.005 n=6
Parse Time	16.68s (± 0.11%)	17.33s (± 0.38%)	+0.66s (+ 3.94%)	17.23s	17.42s	p=0.005 n=6
Bind Time	5.18s (± 0.31%)	4.31s (± 0.35%)	🟩-0.87s (-16.87%)	4.28s	4.32s	p=0.005 n=6
Check Time	89.80s (± 0.21%)	74.27s (± 0.40%)	🟩-15.53s (-17.30%)	73.77s	74.53s	p=0.005 n=6
Emit Time	29.26s (± 0.29%)	27.54s (± 1.38%)	🟩-1.72s (- 5.88%)	26.77s	27.76s	p=0.005 n=6
Total Time	140.91s (± 0.13%)	123.44s (± 0.31%)	🟩-17.47s (-12.40%)	122.94s	123.86s	p=0.005 n=6
webpack - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	267,117	267,117	~	~	~	p=1.000 n=6
Types	108,775	108,775	~	~	~	p=1.000 n=6
Memory used	411,507k (± 0.01%)	464,374k (± 0.01%)	🔻+52,867k (+12.85%)	464,315k	464,477k	p=0.005 n=6
Parse Time	3.19s (± 0.38%)	3.13s (± 0.27%)	-0.06s (- 1.94%)	3.11s	3.13s	p=0.004 n=6
Bind Time	1.41s (± 0.29%)	1.29s (± 0.63%)	🟩-0.12s (- 8.38%)	1.28s	1.30s	p=0.003 n=6
Check Time	14.22s (± 0.14%)	11.93s (± 0.53%)	🟩-2.29s (-16.07%)	11.87s	12.03s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	18.82s (± 0.12%)	16.35s (± 0.32%)	🟩-2.46s (-13.10%)	16.29s	16.42s	p=0.005 n=6
xstate-main - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	525,251	525,251	~	~	~	p=1.000 n=6
Types	178,574	178,574	~	~	~	p=1.000 n=6
Memory used	462,883k (± 0.06%)	510,721k (± 0.06%)	🔻+47,839k (+10.33%)	510,404k	511,148k	p=0.005 n=6
Parse Time	3.17s (± 0.53%)	3.35s (± 1.01%)	🔻+0.19s (+ 5.84%)	3.31s	3.40s	p=0.005 n=6
Bind Time	1.17s	1.07s (± 0.76%)	🟩-0.10s (- 8.26%)	1.06s	1.08s	p=0.003 n=6
Check Time	17.93s (± 0.39%)	14.91s (± 0.29%)	🟩-3.02s (-16.84%)	14.85s	14.98s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	22.27s (± 0.34%)	19.34s (± 0.30%)	🟩-2.93s (-13.14%)	19.24s	19.40s	p=0.005 n=6

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• Compiler-Unions - node (v18.15.0, x64)
• angular-1 - node (v18.15.0, x64)
• mui-docs - node (v18.15.0, x64)
• self-build-src - node (v18.15.0, x64)
• self-build-src-public-api - node (v18.15.0, x64)
• self-compiler - node (v18.15.0, x64)
• ts-pre-modules - node (v18.15.0, x64)
• vscode - node (v18.15.0, x64)
• webpack - node (v18.15.0, x64)
• xstate-main - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

tsserver

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-UnionsTSServer - node (v18.15.0, x64)
Req 1 - updateOpen	2,295ms (± 0.74%)	2,267ms (± 0.34%)	-28ms (- 1.20%)	2,256ms	2,278ms	p=0.031 n=6
Req 2 - geterr	5,081ms (± 0.40%)	4,202ms (± 2.63%)	🟩-879ms (-17.30%)	4,036ms	4,289ms	p=0.005 n=6
Req 3 - references	264ms (± 0.32%)	266ms (± 0.67%)	+3ms (+ 0.95%)	264ms	269ms	p=0.010 n=6
Req 4 - navto	229ms (± 0.53%)	229ms (± 0.92%)	~	227ms	232ms	p=1.000 n=6
Req 5 - completionInfo count	1,357	1,357	~	~	~	p=1.000 n=6
Req 5 - completionInfo	85ms (± 6.42%)	84ms (± 7.95%)	~	73ms	90ms	p=0.567 n=6
CompilerTSServer - node (v18.15.0, x64)
Req 1 - updateOpen	2,423ms (± 0.58%)	2,435ms (± 0.11%)	~	2,432ms	2,439ms	p=0.261 n=6
Req 2 - geterr	3,792ms (± 0.35%)	3,235ms (± 2.73%)	🟩-557ms (-14.69%)	3,149ms	3,324ms	p=0.005 n=6
Req 3 - references	278ms (± 0.30%)	311ms (±11.03%)	🔻+34ms (+12.19%)	278ms	344ms	p=0.009 n=6
Req 4 - navto	226ms (± 0.48%)	232ms (± 2.08%)	+6ms (+ 2.73%)	227ms	240ms	p=0.008 n=6
Req 5 - completionInfo count	1,519	1,519	~	~	~	p=1.000 n=6
Req 5 - completionInfo	73ms (± 8.47%)	71ms (±10.26%)	~	65ms	82ms	p=0.371 n=6
xstate-main-1-tsserver - node (v18.15.0, x64)
Req 1 - updateOpen	5,182ms (± 0.44%)	5,278ms (± 0.65%)	+95ms (+ 1.84%)	5,223ms	5,326ms	p=0.005 n=6
Req 2 - geterr	1,126ms (± 0.94%)	961ms (± 0.57%)	🟩-165ms (-14.63%)	952ms	966ms	p=0.005 n=6
Req 3 - references	77ms (± 3.85%)	89ms (± 4.52%)	🔻+12ms (+15.37%)	86ms	94ms	p=0.004 n=6
Req 4 - navto	458ms (± 0.97%)	331ms (± 0.59%)	🟩-127ms (-27.72%)	329ms	334ms	p=0.005 n=6
Req 5 - completionInfo count	3,413	3,413	~	~	~	p=1.000 n=6
Req 5 - completionInfo	841ms (± 0.65%)	813ms (± 1.56%)	🟩-28ms (- 3.37%)	797ms	827ms	p=0.005 n=6

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• CompilerTSServer - node (v18.15.0, x64)
• Compiler-UnionsTSServer - node (v18.15.0, x64)
• xstate-main-1-tsserver - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

startup

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
tsc-startup - node (v18.15.0, x64)
Execution time	157.10ms (± 0.17%)	158.58ms (± 0.18%)	+1.47ms (+ 0.94%)	157.45ms	162.49ms	p=0.000 n=600
tsserver-startup - node (v18.15.0, x64)
Execution time	232.57ms (± 0.14%)	234.34ms (± 0.15%)	+1.77ms (+ 0.76%)	232.98ms	240.10ms	p=0.000 n=600
tsserverlibrary-startup - node (v18.15.0, x64)
Execution time	227.61ms (± 0.17%)	229.21ms (± 0.13%)	+1.60ms (+ 0.71%)	227.88ms	231.89ms	p=0.000 n=600
typescript-startup - node (v18.15.0, x64)
Execution time	225.93ms (± 0.17%)	227.60ms (± 0.15%)	+1.67ms (+ 0.74%)	226.24ms	234.18ms	p=0.000 n=600

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• tsc-startup - node (v18.15.0, x64)
• tsserver-startup - node (v18.15.0, x64)
• tsserverlibrary-startup - node (v18.15.0, x64)
• typescript-startup - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

Developer Information:

Download Benchmarks

[Titian Cernicova-Dragomir (dragomirtitian)]

Latest perf results seemed to have clawed back most of the parser perf loss.

[Jake Bailey (jakebailey)]

Half a gig of memory for vscode is a bit scary, though, given how close that is to the max memory limit...

[Titian Cernicova-Dragomir (dragomirtitian)]

Jake Bailey (@jakebailey) I did some extra work. I was too eager to make everything monomorphic, a bit of polymorphism is fine. There should be 3 shapes for nodes now: Token, Identifier and Node. There is a 4th one Token with original that I might look into removing, but it doesn't seem to have much impact for now.

With these changes, at least locally the increase in mem usage goes form 13% to about 5%, while keeping the same performance profile.

[Jake Bailey (jakebailey)]

TypeScript Bot (@typescript-bot) perf test this

[TypeScript Bot (typescript-bot)]

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
perf test this	✅ Started	👀 Results

[TypeScript Bot (typescript-bot)]

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-Unions - node (v18.15.0, x64)
Errors	30	30	~	~	~	p=1.000 n=6
Symbols	62,153	62,153	~	~	~	p=1.000 n=6
Types	50,242	50,242	~	~	~	p=1.000 n=6
Memory used	193,924k (± 1.03%)	204,029k (± 0.91%)	🔻+10,104k (+ 5.21%)	202,782k	206,426k	p=0.005 n=6
Parse Time	1.58s (± 1.03%)	1.62s (± 0.64%)	+0.03s (+ 2.11%)	1.60s	1.63s	p=0.007 n=6
Bind Time	0.86s (± 1.20%)	0.86s (± 0.60%)	~	0.86s	0.87s	p=0.793 n=6
Check Time	11.22s (± 0.24%)	8.94s (± 1.08%)	🟩-2.28s (-20.33%)	8.87s	9.11s	p=0.005 n=6
Emit Time	3.27s (± 0.63%)	3.16s (± 0.97%)	🟩-0.11s (- 3.41%)	3.13s	3.21s	p=0.005 n=6
Total Time	16.93s (± 0.27%)	14.58s (± 0.61%)	🟩-2.35s (-13.91%)	14.48s	14.74s	p=0.005 n=6
angular-1 - node (v18.15.0, x64)
Errors	5	5	~	~	~	p=1.000 n=6
Symbols	944,114	944,114	~	~	~	p=1.000 n=6
Types	407,051	407,051	~	~	~	p=1.000 n=6
Memory used	1,218,281k (± 0.00%)	1,295,371k (± 0.00%)	🔻+77,089k (+ 6.33%)	1,295,310k	1,295,431k	p=0.005 n=6
Parse Time	7.94s (± 0.30%)	8.31s (± 0.97%)	🔻+0.37s (+ 4.64%)	8.22s	8.44s	p=0.005 n=6
Bind Time	2.23s (± 0.34%)	2.07s (± 0.59%)	🟩-0.15s (- 6.88%)	2.05s	2.08s	p=0.003 n=6
Check Time	35.77s (± 0.27%)	29.04s (± 0.36%)	🟩-6.72s (-18.79%)	28.86s	29.13s	p=0.005 n=6
Emit Time	16.11s (± 0.56%)	14.93s (± 0.49%)	🟩-1.18s (- 7.31%)	14.84s	15.03s	p=0.005 n=6
Total Time	62.04s (± 0.21%)	54.37s (± 0.37%)	🟩-7.68s (-12.37%)	54.01s	54.58s	p=0.005 n=6
mui-docs - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,135,122	2,135,122	~	~	~	p=1.000 n=6
Types	927,182	927,182	~	~	~	p=1.000 n=6
Memory used	2,117,373k (± 0.01%)	2,199,492k (± 0.00%)	+82,119k (+ 3.88%)	2,199,411k	2,199,584k	p=0.005 n=6
Parse Time	7.92s (± 0.35%)	8.29s (± 2.32%)	🔻+0.37s (+ 4.67%)	8.19s	8.68s	p=0.005 n=6
Bind Time	2.77s (± 0.70%)	2.71s (± 8.48%)	~	2.24s	2.82s	p=0.332 n=6
Check Time	83.86s (± 0.39%)	62.40s (± 0.60%)	🟩-21.46s (-25.59%)	62.04s	63.08s	p=0.005 n=6
Emit Time	0.15s (± 3.53%)	0.16s (± 3.16%)	🔻+0.01s (+ 5.38%)	0.16s	0.17s	p=0.038 n=6
Total Time	94.71s (± 0.31%)	73.56s (± 0.50%)	🟩-21.15s (-22.33%)	73.23s	74.24s	p=0.005 n=6
self-build-src - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,230,804	1,246,046	+15,242 (+ 1.24%)	~	~	p=0.001 n=6
Types	261,202	263,618	+2,416 (+ 0.92%)	~	~	p=0.001 n=6
Memory used	2,356,275k (± 1.03%)	2,474,466k (± 0.03%)	🔻+118,192k (+ 5.02%)	2,473,593k	2,475,488k	p=0.005 n=6
Parse Time	5.95s (± 0.85%)	6.47s (± 1.03%)	🔻+0.52s (+ 8.77%)	6.37s	6.55s	p=0.005 n=6
Bind Time	2.25s (± 0.83%)	2.25s (± 0.76%)	~	2.23s	2.27s	p=0.936 n=6
Check Time	39.81s (± 0.32%)	33.41s (± 0.36%)	🟩-6.39s (-16.06%)	33.30s	33.57s	p=0.005 n=6
Emit Time	3.13s (± 1.38%)	3.58s (± 1.59%)	🔻+0.45s (+14.35%)	3.52s	3.66s	p=0.005 n=6
Total Time	51.15s (± 0.36%)	45.73s (± 0.30%)	🟩-5.42s (-10.59%)	45.54s	45.90s	p=0.005 n=6
self-build-src-public-api - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,230,804	1,246,046	+15,242 (+ 1.24%)	~	~	p=0.001 n=6
Types	261,202	263,618	+2,416 (+ 0.92%)	~	~	p=0.001 n=6
Memory used	2,422,330k (± 0.05%)	2,577,288k (± 0.03%)	🔻+154,958k (+ 6.40%)	2,576,002k	2,578,462k	p=0.005 n=6
Parse Time	7.77s (± 0.89%)	8.17s (± 0.65%)	🔻+0.41s (+ 5.24%)	8.08s	8.24s	p=0.005 n=6
Bind Time	2.52s (± 1.06%)	2.82s (± 0.76%)	🔻+0.31s (+12.12%)	2.80s	2.86s	p=0.005 n=6
Check Time	49.53s (± 0.39%)	41.40s (± 0.28%)	🟩-8.14s (-16.43%)	41.19s	41.52s	p=0.005 n=6
Emit Time	3.92s (± 3.67%)	4.52s (± 3.31%)	🔻+0.60s (+15.21%)	4.34s	4.72s	p=0.005 n=6
Total Time	63.76s (± 0.48%)	56.92s (± 0.39%)	🟩-6.84s (-10.72%)	56.68s	57.25s	p=0.005 n=6
self-compiler - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	258,574	265,896	+7,322 (+ 2.83%)	~	~	p=0.001 n=6
Types	104,825	107,377	+2,552 (+ 2.43%)	~	~	p=0.001 n=6
Memory used	428,212k (± 0.02%)	459,220k (± 0.01%)	🔻+31,008k (+ 7.24%)	459,199k	459,271k	p=0.005 n=6
Parse Time	3.31s (± 0.60%)	3.46s (± 0.75%)	🔻+0.15s (+ 4.53%)	3.43s	3.50s	p=0.005 n=6
Bind Time	1.31s (± 1.67%)	1.30s (± 0.93%)	~	1.28s	1.31s	p=0.324 n=6
Check Time	17.74s (± 0.27%)	14.40s (± 0.55%)	🟩-3.34s (-18.84%)	14.31s	14.52s	p=0.005 n=6
Emit Time	1.36s (± 2.21%)	1.65s (± 2.02%)	🔻+0.28s (+20.63%)	1.58s	1.67s	p=0.004 n=6
Total Time	23.73s (± 0.33%)	20.80s (± 0.34%)	🟩-2.93s (-12.35%)	20.73s	20.91s	p=0.005 n=6
ts-pre-modules - node (v18.15.0, x64)
Errors	35	35	~	~	~	p=1.000 n=6
Symbols	224,565	224,565	~	~	~	p=1.000 n=6
Types	93,734	93,734	~	~	~	p=1.000 n=6
Memory used	369,410k (± 0.01%)	390,898k (± 0.01%)	🔻+21,488k (+ 5.82%)	390,854k	390,974k	p=0.005 n=6
Parse Time	2.77s (± 1.06%)	3.05s (± 0.88%)	🔻+0.28s (+10.17%)	3.03s	3.10s	p=0.005 n=6
Bind Time	1.58s (± 0.98%)	1.38s (± 1.74%)	🟩-0.20s (-12.55%)	1.37s	1.43s	p=0.004 n=6
Check Time	15.41s (± 0.23%)	12.68s (± 0.15%)	🟩-2.73s (-17.69%)	12.66s	12.72s	p=0.004 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	19.76s (± 0.31%)	17.12s (± 0.19%)	🟩-2.64s (-13.37%)	17.09s	17.16s	p=0.005 n=6
vscode - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,880,886	2,880,886	~	~	~	p=1.000 n=6
Types	975,501	975,501	~	~	~	p=1.000 n=6
Memory used	3,042,328k (± 0.00%)	3,227,789k (± 0.00%)	🔻+185,461k (+ 6.10%)	3,227,714k	3,227,862k	p=0.005 n=6
Parse Time	16.73s (± 0.68%)	17.61s (± 0.44%)	🔻+0.89s (+ 5.29%)	17.50s	17.69s	p=0.005 n=6
Bind Time	5.10s (± 0.26%)	4.61s (± 1.15%)	🟩-0.49s (- 9.64%)	4.52s	4.67s	p=0.005 n=6
Check Time	88.86s (± 0.39%)	78.07s (± 0.23%)	🟩-10.79s (-12.14%)	77.85s	78.35s	p=0.005 n=6
Emit Time	29.21s (± 0.50%)	23.23s (± 0.37%)	🟩-5.98s (-20.47%)	23.16s	23.38s	p=0.005 n=6
Total Time	139.90s (± 0.35%)	123.52s (± 0.12%)	🟩-16.38s (-11.71%)	123.30s	123.73s	p=0.005 n=6
webpack - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	267,117	267,117	~	~	~	p=1.000 n=6
Types	108,775	108,775	~	~	~	p=1.000 n=6
Memory used	411,548k (± 0.01%)	434,675k (± 0.01%)	🔻+23,126k (+ 5.62%)	434,608k	434,733k	p=0.005 n=6
Parse Time	3.18s (± 0.65%)	3.27s (± 0.23%)	+0.10s (+ 2.99%)	3.26s	3.28s	p=0.005 n=6
Bind Time	1.41s (± 0.53%)	1.44s (± 0.52%)	+0.03s (+ 1.89%)	1.43s	1.45s	p=0.004 n=6
Check Time	14.19s (± 0.34%)	12.72s (± 0.33%)	🟩-1.47s (-10.34%)	12.66s	12.79s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	18.77s (± 0.26%)	17.43s (± 0.22%)	🟩-1.34s (- 7.16%)	17.38s	17.49s	p=0.005 n=6
xstate-main - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	525,251	525,251	~	~	~	p=1.000 n=6
Types	178,574	178,574	~	~	~	p=1.000 n=6
Memory used	462,712k (± 0.09%)	484,265k (± 0.06%)	🔻+21,553k (+ 4.66%)	484,094k	484,872k	p=0.005 n=6
Parse Time	3.17s (± 0.61%)	3.26s (± 0.71%)	+0.09s (+ 2.84%)	3.23s	3.29s	p=0.005 n=6
Bind Time	1.17s (± 1.16%)	1.15s (± 0.45%)	-0.02s (- 1.70%)	1.15s	1.16s	p=0.006 n=6
Check Time	17.86s (± 0.50%)	15.47s (± 0.23%)	🟩-2.38s (-13.35%)	15.44s	15.53s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	22.20s (± 0.38%)	19.88s (± 0.23%)	🟩-2.31s (-10.41%)	19.82s	19.94s	p=0.005 n=6

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• Compiler-Unions - node (v18.15.0, x64)
• angular-1 - node (v18.15.0, x64)
• mui-docs - node (v18.15.0, x64)
• self-build-src - node (v18.15.0, x64)
• self-build-src-public-api - node (v18.15.0, x64)
• self-compiler - node (v18.15.0, x64)
• ts-pre-modules - node (v18.15.0, x64)
• vscode - node (v18.15.0, x64)
• webpack - node (v18.15.0, x64)
• xstate-main - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

tsserver

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-UnionsTSServer - node (v18.15.0, x64)
Req 1 - updateOpen	2,290ms (± 0.81%)	2,375ms (± 0.75%)	+85ms (+ 3.71%)	2,353ms	2,397ms	p=0.005 n=6
Req 2 - geterr	5,068ms (± 0.29%)	4,364ms (± 0.26%)	🟩-704ms (-13.89%)	4,351ms	4,379ms	p=0.005 n=6
Req 3 - references	264ms (± 0.71%)	273ms (± 0.43%)	+9ms (+ 3.54%)	271ms	274ms	p=0.005 n=6
Req 4 - navto	228ms (± 1.30%)	238ms (± 0.65%)	🔻+11ms (+ 4.62%)	237ms	241ms	p=0.004 n=6
Req 5 - completionInfo count	1,357	1,357	~	~	~	p=1.000 n=6
Req 5 - completionInfo	87ms (± 5.20%)	88ms (± 8.94%)	~	78ms	94ms	p=0.459 n=6
CompilerTSServer - node (v18.15.0, x64)
Req 1 - updateOpen	2,418ms (± 0.70%)	2,517ms (± 0.72%)	🔻+99ms (+ 4.10%)	2,495ms	2,549ms	p=0.005 n=6
Req 2 - geterr	3,801ms (± 0.34%)	3,355ms (± 0.12%)	🟩-446ms (-11.73%)	3,349ms	3,361ms	p=0.005 n=6
Req 3 - references	278ms (± 0.38%)	290ms (± 0.29%)	🔻+12ms (+ 4.32%)	289ms	291ms	p=0.004 n=6
Req 4 - navto	225ms	235ms (± 0.23%)	🔻+10ms (+ 4.22%)	234ms	235ms	p=0.002 n=6
Req 5 - completionInfo count	1,519	1,519	~	~	~	p=1.000 n=6
Req 5 - completionInfo	73ms (± 2.05%)	71ms	🟩-2ms (- 3.18%)	~	~	p=0.003 n=6
xstate-main-1-tsserver - node (v18.15.0, x64)
Req 1 - updateOpen	5,201ms (± 0.50%)	5,336ms (± 0.40%)	+135ms (+ 2.60%)	5,318ms	5,375ms	p=0.005 n=6
Req 2 - geterr	1,115ms (± 0.94%)	974ms (± 0.34%)	🟩-142ms (-12.70%)	970ms	978ms	p=0.005 n=6
Req 3 - references	76ms	98ms (± 3.70%)	🔻+22ms (+28.51%)	96ms	105ms	p=0.002 n=6
Req 4 - navto	456ms (± 0.18%)	372ms (± 0.15%)	🟩-84ms (-18.47%)	371ms	372ms	p=0.004 n=6
Req 5 - completionInfo count	3,413	3,413	~	~	~	p=1.000 n=6
Req 5 - completionInfo	836ms (± 1.23%)	822ms (± 1.36%)	-14ms (- 1.71%)	810ms	835ms	p=0.045 n=6

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• CompilerTSServer - node (v18.15.0, x64)
• Compiler-UnionsTSServer - node (v18.15.0, x64)
• xstate-main-1-tsserver - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

startup

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
tsc-startup - node (v18.15.0, x64)
Execution time	157.09ms (± 0.18%)	158.79ms (± 0.17%)	+1.70ms (+ 1.08%)	157.67ms	162.61ms	p=0.000 n=600
tsserver-startup - node (v18.15.0, x64)
Execution time	232.76ms (± 0.14%)	234.79ms (± 0.13%)	+2.03ms (+ 0.87%)	233.60ms	239.68ms	p=0.000 n=600
tsserverlibrary-startup - node (v18.15.0, x64)
Execution time	226.59ms (± 0.15%)	228.50ms (± 0.14%)	+1.91ms (+ 0.84%)	227.22ms	231.79ms	p=0.000 n=600
typescript-startup - node (v18.15.0, x64)
Execution time	226.60ms (± 0.15%)	228.70ms (± 0.13%)	+2.09ms (+ 0.92%)	227.38ms	230.95ms	p=0.000 n=600

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• tsc-startup - node (v18.15.0, x64)
• tsserver-startup - node (v18.15.0, x64)
• tsserverlibrary-startup - node (v18.15.0, x64)
• typescript-startup - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

Developer Information:

Download Benchmarks

[Jake Bailey (jakebailey)]

Much better, though emit is now much slower on certain benchmarks. Maybe a case or two aren't monomorphic for those benchmarks?

[Titian Cernicova-Dragomir (dragomirtitian)]

For the extra parse time I have a pretty good idea. TextRange has too many shapes. Beyond the 3 AST nodes, we also have at least 2 if not more that come from createNodeArray making setting of positions much more expensive in some cases.

Will look into it a bit more.

[Jake Bailey (jakebailey)]

TypeScript Bot (@typescript-bot) perf test this
TypeScript Bot (@typescript-bot) perf test this faster host=bun@1.1.17

[TypeScript Bot (typescript-bot)]

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
perf test this	✅ Started	👀 Results
perf test this faster host=bun@1.1.17	✅ Started	👀 Results

[TypeScript Bot (typescript-bot)]

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-Unions - bun (v1.1.17, x64)
Errors	30	30	~	~	~	p=1.000 n=6
Symbols	62,153	62,153	~	~	~	p=1.000 n=6
Types	50,242	50,242	~	~	~	p=1.000 n=6
Memory used	245,591k (± 4.51%)	271,787k (± 1.75%)	🔻+26,197k (+10.67%)	266,725k	280,687k	p=0.008 n=6
Parse Time	1.08s (± 1.13%)	1.07s (± 1.15%)	-0.02s (- 1.84%)	1.06s	1.09s	p=0.024 n=6
Bind Time	0.82s (± 0.50%)	0.83s (± 2.48%)	~	0.81s	0.86s	p=0.405 n=6
Check Time	8.68s (± 0.64%)	8.33s (± 1.56%)	🟩-0.36s (- 4.11%)	8.12s	8.51s	p=0.005 n=6
Emit Time	2.89s (± 1.17%)	3.00s (± 2.74%)	+0.11s (+ 3.80%)	2.95s	3.16s	p=0.005 n=6
Total Time	13.49s (± 0.45%)	13.23s (± 0.54%)	-0.26s (- 1.90%)	13.16s	13.37s	p=0.005 n=6
angular-1 - bun (v1.1.17, x64)
Errors	5	5	~	~	~	p=1.000 n=6
Symbols	944,114	944,114	~	~	~	p=1.000 n=6
Types	407,050	407,050	~	~	~	p=1.000 n=6
Memory used	1,274,831k (± 0.54%)	1,435,731k (± 0.17%)	🔻+160,900k (+12.62%)	1,432,805k	1,439,052k	p=0.005 n=6
Parse Time	4.75s (± 0.18%)	4.73s (± 0.28%)	-0.02s (- 0.35%)	4.71s	4.74s	p=0.040 n=6
Bind Time	1.95s (± 1.00%)	1.91s (± 2.96%)	~	1.81s	1.97s	p=0.196 n=6
Check Time	29.67s (± 0.51%)	25.10s (± 0.51%)	🟩-4.57s (-15.42%)	24.93s	25.32s	p=0.005 n=6
Emit Time	11.37s (± 1.50%)	11.25s (± 1.44%)	~	11.08s	11.46s	p=0.261 n=6
Total Time	47.73s (± 0.56%)	42.99s (± 0.37%)	🟩-4.74s (- 9.94%)	42.67s	43.09s	p=0.005 n=6
mui-docs - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,133,039	2,133,039	~	~	~	p=1.000 n=6
Types	926,444	926,444	~	~	~	p=1.000 n=6
Memory used	2,312,288k (± 0.44%)	2,442,773k (± 0.16%)	🔻+130,485k (+ 5.64%)	2,438,826k	2,446,599k	p=0.005 n=6
Parse Time	5.46s (± 0.47%)	5.80s (± 1.00%)	🔻+0.33s (+ 6.13%)	5.75s	5.91s	p=0.005 n=6
Bind Time	1.51s (± 1.42%)	1.60s (± 0.39%)	🔻+0.09s (+ 6.08%)	1.59s	1.61s	p=0.004 n=6
Check Time	64.89s (± 0.59%)	52.64s (± 0.47%)	🟩-12.26s (-18.89%)	52.30s	52.90s	p=0.005 n=6
Emit Time	0.15s	0.15s (± 2.69%)	~	0.15s	0.16s	p=0.405 n=6
Total Time	72.01s (± 0.54%)	60.19s (± 0.47%)	🟩-11.82s (-16.42%)	59.82s	60.57s	p=0.005 n=6
self-build-src - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,224,331	1,242,584	+18,253 (+ 1.49%)	~	~	p=0.001 n=6
Types	261,007	265,198	+4,191 (+ 1.61%)	~	~	p=0.001 n=6
Memory used	8,894,363k (± 1.89%)	10,126,558k (± 2.96%)	🔻+1,232,196k (+13.85%)	9,682,006k	10,561,465k	p=0.005 n=6
Parse Time	5.41s (± 1.30%)	5.42s (± 1.07%)	~	5.36s	5.52s	p=0.684 n=6
Bind Time	2.48s (± 1.44%)	2.61s (± 2.27%)	🔻+0.13s (+ 5.31%)	2.53s	2.71s	p=0.005 n=6
Check Time	43.90s (± 3.70%)	39.95s (± 4.72%)	🟩-3.95s (- 8.99%)	38.67s	42.46s	p=0.031 n=6
Emit Time	2.61s (± 2.75%)	2.81s (± 1.38%)	🔻+0.19s (+ 7.39%)	2.74s	2.84s	p=0.005 n=6
Total Time	54.39s (± 2.98%)	50.79s (± 3.72%)	🟩-3.60s (- 6.62%)	49.42s	53.43s	p=0.031 n=6
self-build-src-public-api - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,224,331	1,242,584	+18,253 (+ 1.49%)	~	~	p=0.001 n=6
Types	261,007	265,198	+4,191 (+ 1.61%)	~	~	p=0.001 n=6
Memory used	5,162,965k (±33.11%)	5,459,368k (±12.12%)	~	4,742,646k	6,167,166k	p=0.066 n=6
Parse Time	3.97s (± 1.76%)	3.87s (± 1.55%)	-0.10s (- 2.60%)	3.79s	3.94s	p=0.019 n=6
Bind Time	1.78s (± 0.94%)	1.92s (± 2.61%)	🔻+0.14s (+ 7.58%)	1.87s	2.00s	p=0.005 n=6
Check Time	33.06s (± 0.90%)	31.44s (± 4.52%)	🟩-1.62s (- 4.91%)	29.50s	32.40s	p=0.005 n=6
Emit Time	1.62s (± 4.56%)	1.97s (± 2.31%)	🔻+0.35s (+21.73%)	1.92s	2.04s	p=0.005 n=6
Total Time	40.42s (± 0.74%)	39.18s (± 3.50%)	🟩-1.24s (- 3.08%)	37.25s	40.21s	p=0.030 n=6
self-compiler - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	258,166	268,004	+9,838 (+ 3.81%)	~	~	p=0.001 n=6
Types	104,689	109,058	🔻+4,369 (+ 4.17%)	~	~	p=0.001 n=6
Memory used	421,994k (± 0.96%)	492,939k (± 0.25%)	🔻+70,945k (+16.81%)	491,737k	495,383k	p=0.005 n=6
Parse Time	3.28s (± 1.04%)	3.22s (± 0.44%)	-0.06s (- 1.88%)	3.20s	3.24s	p=0.006 n=6
Bind Time	1.65s (± 1.97%)	1.60s (± 3.06%)	~	1.54s	1.65s	p=0.090 n=6
Check Time	20.73s (± 0.53%)	19.43s (± 0.38%)	🟩-1.30s (- 6.27%)	19.35s	19.53s	p=0.005 n=6
Emit Time	1.28s (± 1.62%)	1.52s (± 1.95%)	🔻+0.24s (+19.06%)	1.49s	1.57s	p=0.005 n=6
Total Time	26.93s (± 0.41%)	25.76s (± 0.52%)	🟩-1.16s (- 4.32%)	25.60s	25.92s	p=0.005 n=6
ts-pre-modules - bun (v1.1.17, x64)
Errors	35	35	~	~	~	p=1.000 n=6
Symbols	224,565	224,565	~	~	~	p=1.000 n=6
Types	93,734	93,734	~	~	~	p=1.000 n=6
Memory used	354,877k (± 0.04%)	404,915k (± 0.57%)	🔻+50,037k (+14.10%)	402,847k	409,482k	p=0.005 n=6
Parse Time	2.34s (± 1.36%)	2.25s (± 0.36%)	🟩-0.08s (- 3.64%)	2.24s	2.26s	p=0.005 n=6
Bind Time	1.45s (± 0.75%)	1.47s (± 0.70%)	+0.02s (+ 1.15%)	1.45s	1.48s	p=0.032 n=6
Check Time	14.40s (± 0.49%)	13.30s (± 0.72%)	🟩-1.10s (- 7.63%)	13.21s	13.44s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	18.19s (± 0.49%)	17.02s (± 0.56%)	🟩-1.17s (- 6.43%)	16.92s	17.16s	p=0.005 n=6
vscode - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,878,940	2,878,940	~	~	~	p=1.000 n=6
Types	975,074	975,074	~	~	~	p=1.000 n=6
Memory used	3,107,604k (± 0.35%)	3,565,274k (± 0.14%)	🔻+457,670k (+14.73%)	3,559,160k	3,569,963k	p=0.005 n=6
Parse Time	11.15s (± 0.37%)	10.71s (± 1.93%)	🟩-0.43s (- 3.87%)	10.52s	10.94s	p=0.005 n=6
Bind Time	3.70s (± 0.99%)	3.60s (± 5.95%)	~	3.34s	3.81s	p=1.000 n=6
Check Time	65.19s (± 0.35%)	52.50s (± 0.50%)	🟩-12.69s (-19.47%)	52.19s	52.78s	p=0.005 n=6
Emit Time	19.75s (± 0.89%)	19.49s (± 0.75%)	-0.27s (- 1.35%)	19.30s	19.64s	p=0.030 n=6
Total Time	99.79s (± 0.30%)	86.29s (± 0.37%)	🟩-13.50s (-13.53%)	85.83s	86.68s	p=0.005 n=6
webpack - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	267,117	267,117	~	~	~	p=1.000 n=6
Types	108,775	108,775	~	~	~	p=1.000 n=6
Memory used	429,087k (± 0.18%)	463,714k (± 0.53%)	🔻+34,627k (+ 8.07%)	460,293k	466,592k	p=0.005 n=6
Parse Time	3.07s (± 1.17%)	3.06s (± 0.71%)	~	3.03s	3.09s	p=0.466 n=6
Bind Time	1.38s (± 0.85%)	1.51s (± 2.35%)	🔻+0.13s (+ 9.65%)	1.48s	1.58s	p=0.005 n=6
Check Time	13.77s (± 0.42%)	12.73s (± 0.63%)	🟩-1.04s (- 7.54%)	12.63s	12.84s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	18.23s (± 0.55%)	17.30s (± 0.57%)	🟩-0.93s (- 5.10%)	17.19s	17.44s	p=0.005 n=6
xstate-main - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	525,251	525,251	~	~	~	p=1.000 n=6
Types	178,574	178,574	~	~	~	p=1.000 n=6
Memory used	462,061k (± 0.29%)	453,485k (± 0.19%)	-8,576k (- 1.86%)	452,663k	455,076k	p=0.005 n=6
Parse Time	2.72s (± 1.48%)	2.96s (± 4.71%)	🔻+0.23s (+ 8.63%)	2.88s	3.24s	p=0.005 n=6
Bind Time	1.04s (± 5.73%)	0.98s (± 1.78%)	~	0.96s	1.01s	p=0.065 n=6
Check Time	15.86s (± 0.41%)	15.70s (± 0.45%)	-0.16s (- 1.01%)	15.62s	15.79s	p=0.005 n=6
Emit Time	0.00s	0.01s	🔻+0.01s (+ ∞%)	~	~	p=0.001 n=6
Total Time	19.63s (± 0.56%)	19.64s (± 0.65%)	~	19.51s	19.86s	p=1.000 n=6

System info unknown

Hosts

• bun (v1.1.17, x64)

Scenarios

• Compiler-Unions - bun (v1.1.17, x64)
• angular-1 - bun (v1.1.17, x64)
• mui-docs - bun (v1.1.17, x64)
• self-build-src - bun (v1.1.17, x64)
• self-build-src-public-api - bun (v1.1.17, x64)
• self-compiler - bun (v1.1.17, x64)
• ts-pre-modules - bun (v1.1.17, x64)
• vscode - bun (v1.1.17, x64)
• webpack - bun (v1.1.17, x64)
• xstate-main - bun (v1.1.17, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

Developer Information:

Download Benchmarks

[TypeScript Bot (typescript-bot)]

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-Unions - node (v18.15.0, x64)
Errors	30	30	~	~	~	p=1.000 n=6
Symbols	62,153	62,153	~	~	~	p=1.000 n=6
Types	50,242	50,242	~	~	~	p=1.000 n=6
Memory used	194,647k (± 0.92%)	200,834k (± 0.95%)	+6,188k (+ 3.18%)	199,561k	203,385k	p=0.005 n=6
Parse Time	1.58s (± 0.48%)	1.59s (± 1.26%)	~	1.56s	1.62s	p=0.188 n=6
Bind Time	0.86s (± 0.73%)	0.81s (± 1.00%)	🟩-0.05s (- 5.43%)	0.80s	0.82s	p=0.004 n=6
Check Time	11.19s (± 0.21%)	8.65s (± 0.54%)	🟩-2.54s (-22.69%)	8.58s	8.70s	p=0.005 n=6
Emit Time	3.28s (± 0.42%)	3.04s (± 0.62%)	🟩-0.24s (- 7.41%)	3.02s	3.07s	p=0.005 n=6
Total Time	16.91s (± 0.17%)	14.09s (± 0.27%)	🟩-2.82s (-16.67%)	14.04s	14.15s	p=0.005 n=6
angular-1 - node (v18.15.0, x64)
Errors	5	5	~	~	~	p=1.000 n=6
Symbols	944,114	944,114	~	~	~	p=1.000 n=6
Types	407,050	407,050	~	~	~	p=1.000 n=6
Memory used	1,218,381k (± 0.00%)	1,265,388k (± 0.00%)	+47,008k (+ 3.86%)	1,265,338k	1,265,434k	p=0.005 n=6
Parse Time	7.96s (± 0.48%)	7.72s (± 0.44%)	🟩-0.24s (- 3.01%)	7.68s	7.77s	p=0.005 n=6
Bind Time	2.21s (± 0.66%)	1.87s (± 2.07%)	🟩-0.34s (-15.30%)	1.85s	1.95s	p=0.004 n=6
Check Time	35.71s (± 0.23%)	27.69s (± 0.55%)	🟩-8.02s (-22.45%)	27.53s	27.93s	p=0.005 n=6
Emit Time	16.13s (± 0.28%)	14.90s (± 0.27%)	🟩-1.23s (- 7.61%)	14.85s	14.95s	p=0.005 n=6
Total Time	62.01s (± 0.06%)	52.19s (± 0.27%)	🟩-9.82s (-15.84%)	51.99s	52.34s	p=0.005 n=6
mui-docs - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,133,039	2,133,039	~	~	~	p=1.000 n=6
Types	926,444	926,444	~	~	~	p=1.000 n=6
Memory used	2,115,366k (± 0.00%)	2,167,316k (± 0.01%)	+51,950k (+ 2.46%)	2,167,035k	2,167,491k	p=0.005 n=6
Parse Time	7.93s (± 0.33%)	7.92s (± 0.43%)	~	7.87s	7.96s	p=0.627 n=6
Bind Time	2.77s (± 0.49%)	2.66s (± 1.05%)	🟩-0.12s (- 4.21%)	2.62s	2.69s	p=0.005 n=6
Check Time	84.20s (± 0.94%)	61.73s (± 0.08%)	🟩-22.46s (-26.68%)	61.67s	61.80s	p=0.005 n=6
Emit Time	0.16s (± 3.95%)	0.17s (± 3.32%)	~	0.16s	0.17s	p=0.201 n=6
Total Time	95.06s (± 0.85%)	72.48s (± 0.09%)	🟩-22.58s (-23.75%)	72.36s	72.56s	p=0.005 n=6
self-build-src - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,224,331	1,242,584	+18,253 (+ 1.49%)	~	~	p=0.001 n=6
Types	261,007	265,198	+4,191 (+ 1.61%)	~	~	p=0.001 n=6
Memory used	2,339,130k (± 0.02%)	2,424,730k (± 0.02%)	+85,601k (+ 3.66%)	2,423,980k	2,425,137k	p=0.005 n=6
Parse Time	6.02s (± 0.58%)	5.97s (± 1.09%)	~	5.89s	6.06s	p=0.470 n=6
Bind Time	2.25s (± 1.22%)	1.90s (± 0.98%)	🟩-0.34s (-15.28%)	1.88s	1.93s	p=0.005 n=6
Check Time	40.12s (± 0.35%)	33.14s (± 0.21%)	🟩-6.98s (-17.40%)	33.03s	33.25s	p=0.005 n=6
Emit Time	3.13s (± 1.21%)	3.36s (± 2.63%)	🔻+0.23s (+ 7.23%)	3.22s	3.44s	p=0.005 n=6
Total Time	51.54s (± 0.24%)	44.40s (± 0.27%)	🟩-7.14s (-13.86%)	44.24s	44.56s	p=0.005 n=6
self-build-src-public-api - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,224,331	1,242,584	+18,253 (+ 1.49%)	~	~	p=0.001 n=6
Types	261,007	265,198	+4,191 (+ 1.61%)	~	~	p=0.001 n=6
Memory used	2,412,607k (± 0.04%)	2,511,845k (± 0.03%)	🔻+99,239k (+ 4.11%)	2,511,025k	2,512,668k	p=0.005 n=6
Parse Time	5.19s (± 0.76%)	5.07s (± 0.79%)	-0.12s (- 2.34%)	5.01s	5.12s	p=0.005 n=6
Bind Time	1.70s (± 0.48%)	1.62s (± 0.50%)	🟩-0.07s (- 4.32%)	1.61s	1.63s	p=0.004 n=6
Check Time	34.56s (± 0.28%)	28.29s (± 0.12%)	🟩-6.27s (-18.15%)	28.23s	28.32s	p=0.005 n=6
Emit Time	2.75s (± 2.47%)	2.89s (± 1.22%)	🔻+0.14s (+ 5.15%)	2.85s	2.93s	p=0.005 n=6
Total Time	44.21s (± 0.35%)	37.91s (± 0.17%)	🟩-6.30s (-14.24%)	37.83s	38.01s	p=0.005 n=6
self-compiler - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	258,166	268,004	+9,838 (+ 3.81%)	~	~	p=0.001 n=6
Types	104,689	109,058	🔻+4,369 (+ 4.17%)	~	~	p=0.001 n=6
Memory used	427,315k (± 0.01%)	451,209k (± 0.01%)	🔻+23,894k (+ 5.59%)	451,177k	451,253k	p=0.005 n=6
Parse Time	4.07s (± 0.44%)	4.14s (± 0.48%)	+0.07s (+ 1.60%)	4.12s	4.16s	p=0.005 n=6
Bind Time	1.63s (± 1.06%)	1.47s (± 0.51%)	🟩-0.16s (- 9.62%)	1.46s	1.48s	p=0.004 n=6
Check Time	21.97s (± 0.48%)	17.71s (± 0.37%)	🟩-4.26s (-19.39%)	17.66s	17.84s	p=0.005 n=6
Emit Time	1.72s (± 1.45%)	1.78s (± 0.55%)	+0.05s (+ 3.09%)	1.76s	1.79s	p=0.004 n=6
Total Time	29.40s (± 0.36%)	25.10s (± 0.28%)	🟩-4.30s (-14.62%)	25.03s	25.23s	p=0.005 n=6
ts-pre-modules - node (v18.15.0, x64)
Errors	35	35	~	~	~	p=1.000 n=6
Symbols	224,565	224,565	~	~	~	p=1.000 n=6
Types	93,734	93,734	~	~	~	p=1.000 n=6
Memory used	369,521k (± 0.03%)	382,750k (± 0.01%)	+13,229k (+ 3.58%)	382,708k	382,842k	p=0.005 n=6
Parse Time	2.31s (± 0.60%)	2.31s (± 0.71%)	~	2.29s	2.33s	p=0.410 n=6
Bind Time	1.33s (± 1.48%)	1.18s (± 2.10%)	🟩-0.15s (-11.49%)	1.15s	1.22s	p=0.005 n=6
Check Time	13.16s (± 0.24%)	10.46s (± 0.24%)	🟩-2.70s (-20.52%)	10.44s	10.51s	p=0.004 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	16.80s (± 0.26%)	13.96s (± 0.29%)	🟩-2.84s (-16.92%)	13.91s	14.00s	p=0.005 n=6
vscode - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,878,940	2,878,940	~	~	~	p=1.000 n=6
Types	975,074	975,074	~	~	~	p=1.000 n=6
Memory used	3,041,776k (± 0.00%)	3,152,755k (± 0.00%)	+110,980k (+ 3.65%)	3,152,697k	3,152,866k	p=0.005 n=6
Parse Time	13.67s (± 0.42%)	13.36s (± 0.36%)	-0.31s (- 2.28%)	13.30s	13.42s	p=0.005 n=6
Bind Time	4.23s (± 1.79%)	3.40s (± 0.73%)	🟩-0.82s (-19.52%)	3.37s	3.43s	p=0.005 n=6
Check Time	73.45s (± 0.21%)	62.02s (± 0.13%)	🟩-11.43s (-15.56%)	61.92s	62.13s	p=0.005 n=6
Emit Time	24.23s (± 0.54%)	25.68s (± 0.64%)	🔻+1.44s (+ 5.94%)	25.45s	25.85s	p=0.005 n=6
Total Time	115.58s (± 0.13%)	104.46s (± 0.18%)	🟩-11.12s (- 9.62%)	104.22s	104.72s	p=0.005 n=6
webpack - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	267,117	267,117	~	~	~	p=1.000 n=6
Types	108,775	108,775	~	~	~	p=1.000 n=6
Memory used	411,564k (± 0.01%)	424,477k (± 0.01%)	+12,913k (+ 3.14%)	424,428k	424,589k	p=0.005 n=6
Parse Time	3.18s (± 0.31%)	3.09s (± 0.17%)	-0.09s (- 2.78%)	3.09s	3.10s	p=0.004 n=6
Bind Time	1.41s (± 0.94%)	1.27s (± 0.59%)	🟩-0.14s (- 9.70%)	1.26s	1.28s	p=0.004 n=6
Check Time	14.19s (± 0.33%)	11.96s (± 0.25%)	🟩-2.23s (-15.74%)	11.92s	12.00s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	18.78s (± 0.25%)	16.32s (± 0.17%)	🟩-2.46s (-13.11%)	16.28s	16.36s	p=0.005 n=6
xstate-main - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	525,251	525,251	~	~	~	p=1.000 n=6
Types	178,574	178,574	~	~	~	p=1.000 n=6
Memory used	462,790k (± 0.08%)	475,510k (± 0.01%)	+12,720k (+ 2.75%)	475,472k	475,586k	p=0.005 n=6
Parse Time	3.19s (± 0.44%)	3.16s (± 0.92%)	~	3.12s	3.21s	p=0.064 n=6
Bind Time	1.17s (± 0.35%)	1.15s (± 0.65%)	-0.02s (- 1.99%)	1.14s	1.16s	p=0.003 n=6
Check Time	17.95s (± 0.24%)	15.29s (± 0.35%)	🟩-2.66s (-14.84%)	15.20s	15.35s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	22.31s (± 0.21%)	19.59s (± 0.39%)	🟩-2.72s (-12.18%)	19.51s	19.72s	p=0.005 n=6

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• Compiler-Unions - node (v18.15.0, x64)
• angular-1 - node (v18.15.0, x64)
• mui-docs - node (v18.15.0, x64)
• self-build-src - node (v18.15.0, x64)
• self-build-src-public-api - node (v18.15.0, x64)
• self-compiler - node (v18.15.0, x64)
• ts-pre-modules - node (v18.15.0, x64)
• vscode - node (v18.15.0, x64)
• webpack - node (v18.15.0, x64)
• xstate-main - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

tsserver

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-UnionsTSServer - node (v18.15.0, x64)
Req 1 - updateOpen	3,212ms (±10.48%)	3,449ms (± 0.64%)	~	3,409ms	3,469ms	p=0.054 n=6
Req 2 - geterr	7,238ms (± 8.32%)	6,175ms (± 0.52%)	~	6,114ms	6,208ms	p=0.066 n=6
Req 3 - references	392ms (± 0.67%)	391ms (± 0.40%)	~	389ms	393ms	p=0.746 n=6
Req 4 - navto	339ms (± 0.81%)	342ms (± 0.40%)	+4ms (+ 1.08%)	341ms	345ms	p=0.042 n=6
Req 5 - completionInfo count	1,357	1,357	~	~	~	p=1.000 n=6
Req 5 - completionInfo	124ms (±11.78%)	122ms (±10.55%)	~	110ms	147ms	p=0.293 n=6
CompilerTSServer - node (v18.15.0, x64)
Req 1 - updateOpen	3,588ms (± 1.31%)	3,538ms (± 1.34%)	~	3,477ms	3,597ms	p=0.093 n=6
Req 2 - geterr	5,537ms (± 0.49%)	4,725ms (± 0.27%)	🟩-812ms (-14.66%)	4,705ms	4,736ms	p=0.005 n=6
Req 3 - references	416ms (± 0.20%)	422ms (± 0.20%)	+6ms (+ 1.40%)	421ms	423ms	p=0.004 n=6
Req 4 - navto	338ms (± 0.68%)	357ms (± 2.91%)	🔻+19ms (+ 5.47%)	347ms	369ms	p=0.005 n=6
Req 5 - completionInfo count	1,519	1,519	~	~	~	p=1.000 n=6
Req 5 - completionInfo	108ms (± 2.51%)	115ms (± 5.37%)	🔻+7ms (+ 6.16%)	105ms	122ms	p=0.043 n=6
xstate-main-1-tsserver - node (v18.15.0, x64)
Req 1 - updateOpen	5,207ms (± 0.66%)	5,195ms (± 0.96%)	~	5,135ms	5,281ms	p=0.689 n=6
Req 2 - geterr	1,123ms (± 0.34%)	984ms (± 0.45%)	🟩-139ms (-12.41%)	977ms	990ms	p=0.005 n=6
Req 3 - references	77ms (± 3.56%)	83ms (± 3.65%)	🔻+6ms (+ 7.61%)	80ms	88ms	p=0.019 n=6
Req 4 - navto	459ms (± 0.79%)	378ms (± 0.74%)	🟩-81ms (-17.70%)	373ms	380ms	p=0.004 n=6
Req 5 - completionInfo count	3,413	3,413	~	~	~	p=1.000 n=6
Req 5 - completionInfo	826ms (± 1.81%)	872ms (± 0.90%)	🔻+45ms (+ 5.47%)	856ms	878ms	p=0.005 n=6

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• CompilerTSServer - node (v18.15.0, x64)
• Compiler-UnionsTSServer - node (v18.15.0, x64)
• xstate-main-1-tsserver - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

startup

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
tsc-startup - node (v18.15.0, x64)
Execution time	188.88ms (± 0.17%)	190.60ms (± 0.17%)	+1.72ms (+ 0.91%)	188.88ms	196.42ms	p=0.000 n=600
tsserver-startup - node (v18.15.0, x64)
Execution time	284.73ms (± 0.27%)	286.94ms (± 0.29%)	+2.21ms (+ 0.78%)	279.96ms	294.76ms	p=0.000 n=600
tsserverlibrary-startup - node (v18.15.0, x64)
Execution time	226.07ms (± 0.14%)	227.92ms (± 0.18%)	+1.85ms (+ 0.82%)	226.45ms	233.75ms	p=0.000 n=600
typescript-startup - node (v18.15.0, x64)
Execution time	276.26ms (± 0.30%)	278.51ms (± 0.28%)	+2.25ms (+ 0.81%)	271.34ms	282.31ms	p=0.000 n=600

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• tsc-startup - node (v18.15.0, x64)
• tsserver-startup - node (v18.15.0, x64)
• tsserverlibrary-startup - node (v18.15.0, x64)
• typescript-startup - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

Developer Information:

Download Benchmarks

[Rob Palmer (robpalme)]

Good stuff. On Node the mean averages for tsc are:

• a total time win of 15.1% (ranging 9.6% to 23.7%)
• a memory cost of 3.6% (ranging 2.5% to 5.6%)

...which is an exchange rate of 4.2

[michaelm (MichaelMitchell-at)]

Good stuff. On Node the mean averages for tsc are:

• a total time win of 15.1% (ranging 9.6% to 23.7%)
• a memory cost of 3.6% (ranging 2.5% to 5.6%)

...which is an exchange rate of 4.2

It's worth keeping in mind that if TSServer requires more than 4096 MB of memory then VSCode can no longer use its prebuilt version of Node with pointer compression, which has a significant effect on interactivity performance. So it might be worth re-measuring that exchange rate on projects that are close to reaching that threshold. I plan to do this on the Airtable monorepo (which at this point has already blown past the 4GB memory limit, but we hope to eventually bring it down), once the PR is stable.

[Titian Cernicova-Dragomir (dragomirtitian)]

Jake Bailey (@jakebailey) Can you please run the perf tests one more time?

I hope this latest version will bring the mem usage a bit more, either way I think this is at the limit of what I can do to reduce memory usage.

I can cleanup the PR if there is interest in merging this based on these perf metrics.

Beside performance, we should also consider the issue of this being a breaking change for API consumers. Anyone manually iterating over the properties of nodes (either with Object.keys or for .. in) will observe the difference.

Possible future improvements: Actually use data instead of the accessors (both in the compiler and transition API consumers as well). While the accessors seems to perform well, the fact that a lot of them end up being megamorphic hints at the fact that direct access would be faster. Direct access would be monomorphic/polymorphic in many places (although probably not all). More experimentation would be needed to decide if this change would be worth the DX pain.

[Jake Bailey (jakebailey)]

I'll rerun it, though I do think there are still concerns about this particular approach.

TypeScript Bot (@typescript-bot) perf test this
TypeScript Bot (@typescript-bot) perf test this faster host=bun@1.1.17

[TypeScript Bot (typescript-bot)]

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
perf test this	✅ Started	👀 Results
perf test this faster host=bun@1.1.17	✅ Started	👀 Results

[TypeScript Bot (typescript-bot)]

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-Unions - bun (v1.1.17, x64)
Errors	30	30	~	~	~	p=1.000 n=6
Symbols	62,153	62,153	~	~	~	p=1.000 n=6
Types	50,242	50,242	~	~	~	p=1.000 n=6
Memory used	242,764k (± 1.20%)	270,728k (± 1.11%)	🔻+27,963k (+11.52%)	266,203k	273,638k	p=0.005 n=6
Parse Time	1.09s (± 1.16%)	1.07s (± 0.78%)	-0.02s (- 1.38%)	1.07s	1.09s	p=0.038 n=6
Bind Time	0.82s (± 0.92%)	0.81s (± 1.21%)	~	0.80s	0.83s	p=0.167 n=6
Check Time	8.69s (± 0.60%)	7.97s (± 0.52%)	🟩-0.73s (- 8.36%)	7.89s	8.01s	p=0.005 n=6
Emit Time	2.87s (± 1.48%)	2.98s (± 1.52%)	+0.11s (+ 3.89%)	2.93s	3.04s	p=0.005 n=6
Total Time	13.47s (± 0.21%)	12.83s (± 0.64%)	🟩-0.64s (- 4.74%)	12.70s	12.94s	p=0.005 n=6
angular-1 - bun (v1.1.17, x64)
Errors	5	5	~	~	~	p=1.000 n=6
Symbols	944,114	944,114	~	~	~	p=1.000 n=6
Types	407,050	407,050	~	~	~	p=1.000 n=6
Memory used	1,275,656k (± 0.68%)	1,453,136k (± 0.07%)	🔻+177,480k (+13.91%)	1,452,066k	1,454,609k	p=0.005 n=6
Parse Time	4.75s (± 0.22%)	4.75s (± 0.44%)	~	4.72s	4.78s	p=0.869 n=6
Bind Time	1.96s (± 0.62%)	1.87s (± 1.12%)	🟩-0.09s (- 4.43%)	1.85s	1.91s	p=0.005 n=6
Check Time	29.73s (± 0.53%)	23.98s (± 0.39%)	🟩-5.75s (-19.33%)	23.87s	24.14s	p=0.005 n=6
Emit Time	11.35s (± 1.70%)	11.14s (± 1.53%)	~	10.94s	11.45s	p=0.066 n=6
Total Time	47.78s (± 0.62%)	41.74s (± 0.43%)	🟩-6.04s (-12.65%)	41.54s	42.02s	p=0.005 n=6
mui-docs - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,136,980	2,136,980	~	~	~	p=1.000 n=6
Types	929,117	929,117	~	~	~	p=1.000 n=6
Memory used	2,312,597k (± 0.28%)	2,464,135k (± 0.11%)	🔻+151,539k (+ 6.55%)	2,459,266k	2,466,462k	p=0.005 n=6
Parse Time	5.47s (± 0.88%)	5.79s (± 0.46%)	🔻+0.32s (+ 5.82%)	5.76s	5.83s	p=0.005 n=6
Bind Time	1.51s (± 1.94%)	1.66s (± 1.88%)	🔻+0.15s (+ 9.80%)	1.63s	1.70s	p=0.005 n=6
Check Time	64.89s (± 0.82%)	51.14s (± 0.32%)	🟩-13.76s (-21.20%)	50.93s	51.33s	p=0.005 n=6
Emit Time	0.15s (± 2.75%)	0.15s	~	~	~	p=0.405 n=6
Total Time	72.03s (± 0.80%)	58.74s (± 0.26%)	🟩-13.29s (-18.45%)	58.58s	58.94s	p=0.005 n=6
self-build-src - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,225,260	1,243,897	+18,637 (+ 1.52%)	~	~	p=0.001 n=6
Types	261,341	265,541	+4,200 (+ 1.61%)	~	~	p=0.001 n=6
Memory used	9,070,572k (± 1.58%)	10,385,546k (± 0.33%)	🔻+1,314,974k (+14.50%)	10,349,092k	10,444,220k	p=0.005 n=6
Parse Time	4.05s (± 0.53%)	4.00s (± 0.61%)	-0.04s (- 1.03%)	3.98s	4.04s	p=0.030 n=6
Bind Time	1.71s (± 1.21%)	1.87s (± 3.05%)	🔻+0.17s (+ 9.87%)	1.80s	1.96s	p=0.005 n=6
Check Time	31.64s (± 0.50%)	26.48s (± 0.44%)	🟩-5.16s (-16.32%)	26.36s	26.66s	p=0.005 n=6
Emit Time	1.77s (± 0.92%)	1.81s (± 1.08%)	+0.04s (+ 2.26%)	1.79s	1.83s	p=0.011 n=6
Total Time	39.18s (± 0.45%)	34.17s (± 0.27%)	🟩-5.01s (-12.79%)	34.09s	34.35s	p=0.005 n=6
self-build-src-public-api - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,225,260	1,243,897	+18,637 (+ 1.52%)	~	~	p=0.001 n=6
Types	261,341	265,541	+4,200 (+ 1.61%)	~	~	p=0.001 n=6
Memory used	5,828,138k (±38.89%)	8,850,265k (±24.77%)	🔻+3,022,127k (+51.85%)	5,809,658k	10,285,605k	p=0.031 n=6
Parse Time	4.77s (± 1.23%)	4.88s (± 1.09%)	+0.11s (+ 2.24%)	4.81s	4.95s	p=0.013 n=6
Bind Time	2.14s (± 3.64%)	2.15s (± 3.80%)	~	2.08s	2.30s	p=0.810 n=6
Check Time	39.24s (± 3.79%)	34.52s (± 2.09%)	🟩-4.73s (-12.04%)	34.08s	35.97s	p=0.005 n=6
Emit Time	1.97s (± 6.60%)	2.23s (± 3.92%)	🔻+0.25s (+12.83%)	2.15s	2.40s	p=0.005 n=6
Total Time	48.12s (± 3.22%)	43.76s (± 1.81%)	🟩-4.36s (- 9.06%)	43.26s	45.35s	p=0.005 n=6
self-compiler - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	258,194	268,439	+10,245 (+ 3.97%)	~	~	p=0.001 n=6
Types	104,737	109,115	🔻+4,378 (+ 4.18%)	~	~	p=0.001 n=6
Memory used	419,866k (± 1.25%)	483,535k (± 1.50%)	🔻+63,669k (+15.16%)	477,256k	494,647k	p=0.005 n=6
Parse Time	3.26s (± 1.24%)	3.21s (± 0.92%)	~	3.18s	3.26s	p=0.061 n=6
Bind Time	1.71s (± 4.26%)	1.62s (± 1.44%)	🟩-0.08s (- 4.88%)	1.60s	1.65s	p=0.008 n=6
Check Time	20.63s (± 0.91%)	18.46s (± 0.41%)	🟩-2.18s (-10.54%)	18.38s	18.56s	p=0.005 n=6
Emit Time	1.25s (± 3.86%)	1.47s (± 3.05%)	🔻+0.23s (+18.21%)	1.39s	1.52s	p=0.005 n=6
Total Time	26.84s (± 0.47%)	24.77s (± 0.40%)	🟩-2.08s (- 7.74%)	24.65s	24.90s	p=0.005 n=6
ts-pre-modules - bun (v1.1.17, x64)
Errors	35	35	~	~	~	p=1.000 n=6
Symbols	224,565	224,565	~	~	~	p=1.000 n=6
Types	93,734	93,734	~	~	~	p=1.000 n=6
Memory used	354,957k (± 0.13%)	409,212k (± 0.59%)	🔻+54,255k (+15.28%)	407,048k	412,365k	p=0.005 n=6
Parse Time	2.31s (± 0.84%)	2.25s (± 0.72%)	-0.06s (- 2.52%)	2.23s	2.28s	p=0.005 n=6
Bind Time	1.45s (± 1.55%)	1.47s (± 1.27%)	~	1.44s	1.49s	p=0.123 n=6
Check Time	14.38s (± 0.63%)	12.58s (± 0.62%)	🟩-1.80s (-12.52%)	12.46s	12.70s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	18.13s (± 0.53%)	16.30s (± 0.53%)	🟩-1.84s (-10.14%)	16.21s	16.45s	p=0.005 n=6
vscode - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,879,347	2,879,347	~	~	~	p=1.000 n=6
Types	975,216	975,216	~	~	~	p=1.000 n=6
Memory used	3,099,929k (± 0.16%)	3,618,962k (± 0.55%)	🔻+519,033k (+16.74%)	3,604,828k	3,647,106k	p=0.005 n=6
Parse Time	12.85s (±10.27%)	13.45s (± 1.27%)	~	13.31s	13.69s	p=0.689 n=6
Bind Time	4.32s (±10.26%)	4.25s (± 0.49%)	~	4.23s	4.29s	p=0.377 n=6
Check Time	74.75s (± 9.78%)	62.01s (± 0.92%)	🟩-12.74s (-17.04%)	61.26s	62.67s	p=0.005 n=6
Emit Time	22.64s (±10.14%)	22.93s (± 8.14%)	~	20.46s	24.42s	p=0.936 n=6
Total Time	114.56s (± 9.91%)	102.64s (± 1.23%)	~	100.93s	103.91s	p=0.378 n=6
webpack - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	267,117	267,117	~	~	~	p=1.000 n=6
Types	108,775	108,775	~	~	~	p=1.000 n=6
Memory used	429,397k (± 0.21%)	465,418k (± 0.66%)	🔻+36,022k (+ 8.39%)	460,961k	468,633k	p=0.005 n=6
Parse Time	3.10s (± 0.24%)	3.10s (± 1.07%)	~	3.05s	3.14s	p=0.805 n=6
Bind Time	1.38s (± 1.36%)	1.51s (± 1.43%)	🔻+0.14s (+10.18%)	1.49s	1.55s	p=0.005 n=6
Check Time	13.78s (± 0.29%)	12.30s (± 0.44%)	🟩-1.48s (-10.77%)	12.24s	12.38s	p=0.005 n=6
Emit Time	0.00s	0.00s (±244.70%)	~	0.00s	0.01s	p=0.405 n=6
Total Time	18.26s (± 0.14%)	16.92s (± 0.31%)	🟩-1.34s (- 7.36%)	16.84s	17.00s	p=0.005 n=6
xstate-main - bun (v1.1.17, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	525,251	525,251	~	~	~	p=1.000 n=6
Types	178,574	178,574	~	~	~	p=1.000 n=6
Memory used	454,859k (± 4.91%)	455,861k (± 0.51%)	~	451,557k	457,939k	p=0.066 n=6
Parse Time	2.71s (± 1.20%)	2.87s (± 0.53%)	🔻+0.15s (+ 5.59%)	2.84s	2.88s	p=0.005 n=6
Bind Time	0.98s (± 6.94%)	1.10s (± 4.81%)	🔻+0.12s (+11.71%)	0.99s	1.13s	p=0.012 n=6
Check Time	15.96s (± 0.76%)	14.45s (± 0.73%)	🟩-1.50s (- 9.41%)	14.35s	14.63s	p=0.005 n=6
Emit Time	0.00s	0.01s (±48.94%)	🔻+0.01s (+ ∞%)	0.00s	0.01s	p=0.007 n=6
Total Time	19.65s (± 0.53%)	18.43s (± 0.38%)	🟩-1.23s (- 6.26%)	18.33s	18.51s	p=0.005 n=6

System info unknown

Hosts

• bun (v1.1.17, x64)

Scenarios

• Compiler-Unions - bun (v1.1.17, x64)
• angular-1 - bun (v1.1.17, x64)
• mui-docs - bun (v1.1.17, x64)
• self-build-src - bun (v1.1.17, x64)
• self-build-src-public-api - bun (v1.1.17, x64)
• self-compiler - bun (v1.1.17, x64)
• ts-pre-modules - bun (v1.1.17, x64)
• vscode - bun (v1.1.17, x64)
• webpack - bun (v1.1.17, x64)
• xstate-main - bun (v1.1.17, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

Developer Information:

Download Benchmarks

[TypeScript Bot (typescript-bot)]

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-Unions - node (v18.15.0, x64)
Errors	30	30	~	~	~	p=1.000 n=6
Symbols	62,153	62,153	~	~	~	p=1.000 n=6
Types	50,242	50,242	~	~	~	p=1.000 n=6
Memory used	193,293k (± 0.96%)	199,044k (± 0.96%)	+5,751k (+ 2.98%)	197,768k	201,582k	p=0.005 n=6
Parse Time	1.95s (± 1.11%)	2.04s (± 1.48%)	🔻+0.09s (+ 4.63%)	1.99s	2.08s	p=0.005 n=6
Bind Time	1.06s (± 1.51%)	1.01s (± 0.63%)	🟩-0.05s (- 4.87%)	1.00s	1.02s	p=0.004 n=6
Check Time	13.85s (± 0.32%)	10.46s (± 0.41%)	🟩-3.39s (-24.48%)	10.41s	10.52s	p=0.005 n=6
Emit Time	4.07s (± 3.71%)	3.77s (± 1.29%)	🟩-0.30s (- 7.26%)	3.68s	3.81s	p=0.005 n=6
Total Time	20.92s (± 0.82%)	17.27s (± 0.47%)	🟩-3.65s (-17.44%)	17.15s	17.39s	p=0.005 n=6
angular-1 - node (v18.15.0, x64)
Errors	5	5	~	~	~	p=1.000 n=6
Symbols	944,114	944,114	~	~	~	p=1.000 n=6
Types	407,050	407,050	~	~	~	p=1.000 n=6
Memory used	1,218,384k (± 0.00%)	1,251,932k (± 0.00%)	+33,547k (+ 2.75%)	1,251,878k	1,252,003k	p=0.005 n=6
Parse Time	7.98s (± 0.86%)	7.79s (± 0.58%)	-0.19s (- 2.38%)	7.73s	7.86s	p=0.005 n=6
Bind Time	2.25s (± 1.80%)	1.91s (± 0.57%)	🟩-0.34s (-14.92%)	1.90s	1.93s	p=0.005 n=6
Check Time	35.80s (± 0.37%)	27.31s (± 0.35%)	🟩-8.50s (-23.74%)	27.17s	27.41s	p=0.005 n=6
Emit Time	16.13s (± 0.49%)	14.96s (± 0.30%)	🟩-1.18s (- 7.28%)	14.90s	15.02s	p=0.005 n=6
Total Time	62.16s (± 0.17%)	51.96s (± 0.19%)	🟩-10.20s (-16.41%)	51.85s	52.10s	p=0.005 n=6
mui-docs - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,136,980	2,136,980	~	~	~	p=1.000 n=6
Types	929,117	929,117	~	~	~	p=1.000 n=6
Memory used	2,117,752k (± 0.00%)	2,157,609k (± 0.00%)	+39,857k (+ 1.88%)	2,157,555k	2,157,687k	p=0.005 n=6
Parse Time	7.91s (± 0.35%)	7.97s (± 0.26%)	+0.06s (+ 0.74%)	7.95s	8.01s	p=0.006 n=6
Bind Time	2.76s (± 0.55%)	2.68s (± 0.55%)	-0.08s (- 2.84%)	2.66s	2.70s	p=0.005 n=6
Check Time	83.59s (± 0.89%)	61.19s (± 0.40%)	🟩-22.41s (-26.80%)	60.92s	61.54s	p=0.005 n=6
Emit Time	0.16s (± 3.95%)	0.17s (± 3.10%)	~	0.16s	0.17s	p=0.091 n=6
Total Time	94.42s (± 0.77%)	72.00s (± 0.36%)	🟩-22.42s (-23.74%)	71.72s	72.35s	p=0.005 n=6
self-build-src - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,225,260	1,243,897	+18,637 (+ 1.52%)	~	~	p=0.001 n=6
Types	261,341	265,541	+4,200 (+ 1.61%)	~	~	p=0.001 n=6
Memory used	2,340,931k (± 0.03%)	2,412,903k (± 1.02%)	+71,972k (+ 3.07%)	2,401,115k	2,463,312k	p=0.005 n=6
Parse Time	5.04s (± 1.06%)	4.96s (± 1.42%)	~	4.90s	5.09s	p=0.078 n=6
Bind Time	1.90s (± 0.77%)	1.65s (± 0.97%)	🟩-0.25s (-13.15%)	1.63s	1.67s	p=0.005 n=6
Check Time	34.21s (± 0.37%)	27.70s (± 0.30%)	🟩-6.51s (-19.03%)	27.61s	27.80s	p=0.005 n=6
Emit Time	2.53s (± 1.21%)	2.73s (± 3.37%)	🔻+0.19s (+ 7.70%)	2.60s	2.87s	p=0.005 n=6
Total Time	43.71s (± 0.31%)	37.08s (± 0.45%)	🟩-6.64s (-15.18%)	36.84s	37.30s	p=0.005 n=6
self-build-src-public-api - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	1,225,260	1,243,897	+18,637 (+ 1.52%)	~	~	p=0.001 n=6
Types	261,341	265,541	+4,200 (+ 1.61%)	~	~	p=0.001 n=6
Memory used	2,414,838k (± 0.07%)	2,492,479k (± 0.14%)	+77,641k (+ 3.22%)	2,490,230k	2,499,661k	p=0.005 n=6
Parse Time	6.24s (± 0.82%)	6.15s (± 1.12%)	~	6.07s	6.24s	p=0.128 n=6
Bind Time	2.03s (± 0.67%)	1.99s (± 0.84%)	-0.04s (- 2.13%)	1.96s	2.01s	p=0.005 n=6
Check Time	40.95s (± 0.62%)	32.80s (± 0.25%)	🟩-8.16s (-19.92%)	32.71s	32.95s	p=0.005 n=6
Emit Time	3.09s (± 4.12%)	3.21s (± 5.54%)	~	3.07s	3.55s	p=0.149 n=6
Total Time	52.34s (± 0.51%)	44.17s (± 0.58%)	🟩-8.16s (-15.60%)	43.99s	44.65s	p=0.005 n=6
self-compiler - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	258,194	268,439	+10,245 (+ 3.97%)	~	~	p=0.001 n=6
Types	104,737	109,115	🔻+4,378 (+ 4.18%)	~	~	p=0.001 n=6
Memory used	427,501k (± 0.02%)	446,329k (± 0.01%)	🔻+18,829k (+ 4.40%)	446,293k	446,414k	p=0.005 n=6
Parse Time	4.07s (± 0.55%)	4.12s (± 0.61%)	+0.05s (+ 1.15%)	4.09s	4.15s	p=0.019 n=6
Bind Time	1.63s (± 0.87%)	1.47s (± 1.65%)	🟩-0.15s (- 9.51%)	1.44s	1.51s	p=0.005 n=6
Check Time	21.98s (± 0.22%)	17.35s (± 0.42%)	🟩-4.64s (-21.08%)	17.26s	17.43s	p=0.005 n=6
Emit Time	1.55s (± 1.03%)	1.56s (± 1.59%)	~	1.53s	1.60s	p=0.624 n=6
Total Time	29.23s (± 0.14%)	24.50s (± 0.25%)	🟩-4.74s (-16.20%)	24.44s	24.58s	p=0.005 n=6
ts-pre-modules - node (v18.15.0, x64)
Errors	35	35	~	~	~	p=1.000 n=6
Symbols	224,565	224,565	~	~	~	p=1.000 n=6
Types	93,734	93,734	~	~	~	p=1.000 n=6
Memory used	369,449k (± 0.03%)	378,436k (± 0.01%)	+8,987k (+ 2.43%)	378,405k	378,467k	p=0.005 n=6
Parse Time	2.77s (± 1.44%)	2.80s (± 0.84%)	~	2.77s	2.82s	p=0.056 n=6
Bind Time	1.58s (± 0.86%)	1.44s (± 0.98%)	🟩-0.14s (- 9.05%)	1.42s	1.46s	p=0.004 n=6
Check Time	15.49s (± 0.31%)	12.05s (± 0.36%)	🟩-3.43s (-22.18%)	11.97s	12.10s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	19.84s (± 0.40%)	16.30s (± 0.32%)	🟩-3.54s (-17.85%)	16.21s	16.37s	p=0.005 n=6
vscode - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	2,879,347	2,879,347	~	~	~	p=1.000 n=6
Types	975,216	975,216	~	~	~	p=1.000 n=6
Memory used	3,042,393k (± 0.00%)	3,124,829k (± 0.01%)	+82,436k (+ 2.71%)	3,124,509k	3,125,279k	p=0.005 n=6
Parse Time	11.45s (± 0.39%)	11.23s (± 0.35%)	-0.22s (- 1.91%)	11.17s	11.29s	p=0.005 n=6
Bind Time	3.60s (± 2.64%)	2.93s (± 0.50%)	🟩-0.67s (-18.66%)	2.91s	2.95s	p=0.005 n=6
Check Time	64.47s (± 2.78%)	52.97s (± 0.21%)	🟩-11.49s (-17.83%)	52.82s	53.10s	p=0.005 n=6
Emit Time	19.29s (± 7.42%)	21.29s (± 1.92%)	🔻+2.00s (+10.38%)	20.97s	21.90s	p=0.005 n=6
Total Time	98.81s (± 0.44%)	88.42s (± 0.49%)	🟩-10.38s (-10.51%)	88.06s	89.05s	p=0.005 n=6
webpack - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	267,117	267,117	~	~	~	p=1.000 n=6
Types	108,775	108,775	~	~	~	p=1.000 n=6
Memory used	411,582k (± 0.02%)	420,166k (± 0.01%)	+8,584k (+ 2.09%)	420,103k	420,218k	p=0.005 n=6
Parse Time	3.82s (± 0.54%)	3.83s (± 0.60%)	~	3.80s	3.87s	p=0.684 n=6
Bind Time	1.68s (± 0.92%)	1.52s (± 1.02%)	🟩-0.16s (- 9.52%)	1.51s	1.55s	p=0.004 n=6
Check Time	16.71s (± 0.43%)	13.95s (± 0.12%)	🟩-2.77s (-16.55%)	13.93s	13.97s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	22.22s (± 0.18%)	19.30s (± 0.14%)	🟩-2.92s (-13.14%)	19.27s	19.33s	p=0.005 n=6
xstate-main - node (v18.15.0, x64)
Errors	0	0	~	~	~	p=1.000 n=6
Symbols	525,251	525,251	~	~	~	p=1.000 n=6
Types	178,574	178,574	~	~	~	p=1.000 n=6
Memory used	462,921k (± 0.07%)	471,998k (± 0.08%)	+9,077k (+ 1.96%)	471,588k	472,469k	p=0.005 n=6
Parse Time	3.93s (± 0.58%)	3.92s (± 0.53%)	~	3.90s	3.95s	p=0.683 n=6
Bind Time	1.45s (± 0.81%)	1.40s (± 0.58%)	🟩-0.04s (- 3.11%)	1.39s	1.41s	p=0.004 n=6
Check Time	22.14s (± 0.19%)	18.43s (± 0.16%)	🟩-3.71s (-16.76%)	18.40s	18.47s	p=0.005 n=6
Emit Time	0.00s	0.00s	~	~	~	p=1.000 n=6
Total Time	27.52s (± 0.22%)	23.76s (± 0.14%)	🟩-3.76s (-13.68%)	23.71s	23.80s	p=0.005 n=6

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• Compiler-Unions - node (v18.15.0, x64)
• angular-1 - node (v18.15.0, x64)
• mui-docs - node (v18.15.0, x64)
• self-build-src - node (v18.15.0, x64)
• self-build-src-public-api - node (v18.15.0, x64)
• self-compiler - node (v18.15.0, x64)
• ts-pre-modules - node (v18.15.0, x64)
• vscode - node (v18.15.0, x64)
• webpack - node (v18.15.0, x64)
• xstate-main - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

tsserver

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
Compiler-UnionsTSServer - node (v18.15.0, x64)
Req 1 - updateOpen	2,302ms (± 0.34%)	2,333ms (± 0.67%)	+31ms (+ 1.32%)	2,311ms	2,356ms	p=0.008 n=6
Req 2 - geterr	5,074ms (± 0.14%)	4,125ms (± 0.30%)	🟩-949ms (-18.70%)	4,103ms	4,139ms	p=0.005 n=6
Req 3 - references	264ms (± 0.24%)	270ms (± 1.26%)	+6ms (+ 2.27%)	266ms	274ms	p=0.004 n=6
Req 4 - navto	228ms (± 0.18%)	230ms (± 0.18%)	+2ms (+ 0.88%)	229ms	230ms	p=0.003 n=6
Req 5 - completionInfo count	1,357	1,357	~	~	~	p=1.000 n=6
Req 5 - completionInfo	88ms	80ms (± 2.95%)	🟩-9ms (- 9.66%)	78ms	84ms	p=0.003 n=6
CompilerTSServer - node (v18.15.0, x64)
Req 1 - updateOpen	3,575ms (± 0.91%)	3,601ms (± 1.25%)	~	3,565ms	3,677ms	p=0.149 n=6
Req 2 - geterr	5,547ms (± 0.43%)	4,669ms (± 0.59%)	🟩-878ms (-15.83%)	4,623ms	4,697ms	p=0.005 n=6
Req 3 - references	415ms (± 0.20%)	425ms (± 0.64%)	+10ms (+ 2.29%)	422ms	428ms	p=0.005 n=6
Req 4 - navto	338ms (± 0.66%)	354ms (± 2.49%)	🔻+15ms (+ 4.53%)	343ms	362ms	p=0.004 n=6
Req 5 - completionInfo count	1,519	1,519	~	~	~	p=1.000 n=6
Req 5 - completionInfo	108ms (± 3.49%)	120ms (± 2.38%)	🔻+12ms (+11.13%)	114ms	121ms	p=0.003 n=6
xstate-main-1-tsserver - node (v18.15.0, x64)
Req 1 - updateOpen	5,208ms (± 0.78%)	5,209ms (± 0.43%)	~	5,185ms	5,243ms	p=0.810 n=6
Req 2 - geterr	1,126ms (± 0.92%)	956ms (± 1.46%)	🟩-171ms (-15.15%)	930ms	971ms	p=0.005 n=6
Req 3 - references	77ms (± 4.19%)	84ms (± 4.21%)	🔻+8ms (+10.02%)	81ms	89ms	p=0.018 n=6
Req 4 - navto	458ms (± 0.23%)	376ms (± 0.86%)	🟩-81ms (-17.78%)	372ms	380ms	p=0.005 n=6
Req 5 - completionInfo count	3,413	3,413	~	~	~	p=1.000 n=6
Req 5 - completionInfo	829ms (± 1.80%)	861ms (± 0.91%)	+32ms (+ 3.86%)	852ms	872ms	p=0.016 n=6

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• CompilerTSServer - node (v18.15.0, x64)
• Compiler-UnionsTSServer - node (v18.15.0, x64)
• xstate-main-1-tsserver - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

startup

Comparison Report - baseline..pr

Metric	baseline	pr	Delta	Best	Worst	p-value
tsc-startup - node (v18.15.0, x64)
Execution time	187.92ms (± 0.19%)	189.99ms (± 0.18%)	+2.07ms (+ 1.10%)	187.96ms	193.65ms	p=0.000 n=600
tsserver-startup - node (v18.15.0, x64)
Execution time	283.75ms (± 0.28%)	285.86ms (± 0.28%)	+2.11ms (+ 0.74%)	279.63ms	291.74ms	p=0.000 n=600
tsserverlibrary-startup - node (v18.15.0, x64)
Execution time	277.08ms (± 0.28%)	279.35ms (± 0.29%)	+2.26ms (+ 0.82%)	272.24ms	289.38ms	p=0.000 n=600
typescript-startup - node (v18.15.0, x64)
Execution time	226.88ms (± 0.14%)	228.64ms (± 0.16%)	+1.76ms (+ 0.78%)	226.96ms	234.68ms	p=0.000 n=600

System info unknown

Hosts

• node (v18.15.0, x64)

Scenarios

• tsc-startup - node (v18.15.0, x64)
• tsserver-startup - node (v18.15.0, x64)
• tsserverlibrary-startup - node (v18.15.0, x64)
• typescript-startup - node (v18.15.0, x64)

Benchmark	Name	Iterations
Current	pr	6
Baseline	baseline	6

Developer Information:

Download Benchmarks

[Rob Palmer (robpalme)]

Wow that's even better. On Node the mean averages for tsc are now:

• a total time win of 16.0% (ranging 10.5% to 23.7%)
• a checker time win of 20.8% (ranging 16.6% to 26.8%)
• a memory cost of 2.7% (ranging 1.9% to 4.4%)

...which is an exchange rate of 5.8 on total time, and 7.6 on checker time.

[TypeScript Bot (typescript-bot)]

This PR doesn't have any linked issues. Please open an issue that references this PR. From there we can discuss and prioritise.

[Titian Cernicova-Dragomir (dragomirtitian)]

Conclusions from breaking down where the performance win comes from:

AST Nodes:
- total time win: 3.3% - 9%
- Check Time win: 3.7% - 11%
- Mem cost: ~0-1%

Types:
- total time win: 4.1% - 20%
- Check Time win: 5.3% - 22.5%
- Mem cost: 0.75%-1.2%

Signatures:
- total time win: 0.45% - 1.72%
- Check Time win: 0.56% - 2.04%
- Mem cost: ~0%

The AST nodes win is smaller than I remember in the first experiments. This is probably due to the reduction in memory which meant some relatively common properties are now in data not in Node.

[David Michon (dmichon-msft)]

It might look a bit silly, but if any of these accessors are a particular hot path, you can make an accessor monomorphic by having a switch/case on this.kind and having several branches that all read e.g. this.data.sourceText but behind different case headers.

[Titian Cernicova-Dragomir (dragomirtitian)]

I tried that. It did not improve performance in my experiment. And I tried several different versions.. switch, if - linear search, if-binary search. All performed worse.