Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64) #65452

Open
Open
Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64)#65452
Labels
feature requestIssues requesting new Node.js features.

Description

@marcpems
marcpems
opened on Aug 21, 2026

What is the problem this feature will solve?

Improve performance of Windows builds by 15% by backporting the perf improvements brought through PGO and ThinLTO enablement, from v26 to v24 LTS releases.

See issue #61964 for work description for the v26 changes.
Separate perf suite results are here
ThinLTO: https://github.com/JaneaSystems/node-thin-lto-perf
PGO: https://github.com/JaneaSystems/node-pgo-perf

What is the feature you are proposing to solve the problem?

Backport the relevant PRs (and related config changes the the build):

What alternatives have you considered?

none

Activity

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    , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
     blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

    Skip to content
    Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64) #65452
    Open
    Open
    Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64)#65452
    Labels
    feature requestIssues requesting new Node.js features.
    Description
    @marcpems
    marcpems
    opened on Aug 21, 2026
    What is the problem this feature will solve?
    Improve performance of Windows builds by 15% by backporting the perf improvements brought through PGO and ThinLTO enablement, from v26 to v24 LTS releases.
    See issue #61964 for work description for the v26 changes.
    
Separate perf suite results are here
    
ThinLTO: https://github.com/JaneaSystems/node-thin-lto-perf
    
PGO: https://github.com/JaneaSystems/node-pgo-perf
    What is the feature you are proposing to solve the problem?
    Backport the relevant PRs (and related config changes the the build):
    What alternatives have you considered?
    none
    Activity
    Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
    Metadata
    Metadata
    Assignees
    No one assigned
      Labels
      feature requestIssues requesting new Node.js features.
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      Milestone
      No milestone
      Relationships
      None yet
      Development
      No branches or pull requests
      Issue actions
      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

      Skip to content
      Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64) #65452
      Open
      Open
      Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64)#65452
      Labels
      feature requestIssues requesting new Node.js features.
      Description
      @marcpems
      marcpems
      opened on Aug 21, 2026
      What is the problem this feature will solve?
      Improve performance of Windows builds by 15% by backporting the perf improvements brought through PGO and ThinLTO enablement, from v26 to v24 LTS releases.
      See issue #61964 for work description for the v26 changes.
      
Separate perf suite results are here
      
ThinLTO: https://github.com/JaneaSystems/node-thin-lto-perf
      
PGO: https://github.com/JaneaSystems/node-pgo-perf
      What is the feature you are proposing to solve the problem?
      Backport the relevant PRs (and related config changes the the build):
      What alternatives have you considered?
      none
      Activity
      Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        feature requestIssues requesting new Node.js features.
        Type
        No type
        Projects
        Milestone
        No milestone
        Relationships
        None yet
        Development
        No branches or pull requests
        Issue actions
        
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

        Skip to content
        Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64) #65452
        Open
        Open
        Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64)#65452
        Labels
        feature requestIssues requesting new Node.js features.
        Description
        @marcpems
        marcpems
        opened on Aug 21, 2026
        What is the problem this feature will solve?
        Improve performance of Windows builds by 15% by backporting the perf improvements brought through PGO and ThinLTO enablement, from v26 to v24 LTS releases.
        See issue #61964 for work description for the v26 changes.
        
Separate perf suite results are here
        
ThinLTO: https://github.com/JaneaSystems/node-thin-lto-perf
        
PGO: https://github.com/JaneaSystems/node-pgo-perf
        What is the feature you are proposing to solve the problem?
        Backport the relevant PRs (and related config changes the the build):
        What alternatives have you considered?
        none
        Activity
        Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
        Metadata
        Metadata
        Assignees
        No one assigned
          Labels
          feature requestIssues requesting new Node.js features.
          Type
          No type
          Projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

          Skip to content
          Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64) #65452
          Open
          Open
          Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64)#65452
          Labels
          feature requestIssues requesting new Node.js features.
          Description
          @marcpems
          marcpems
          opened on Aug 21, 2026
          What is the problem this feature will solve?
          Improve performance of Windows builds by 15% by backporting the perf improvements brought through PGO and ThinLTO enablement, from v26 to v24 LTS releases.
          See issue #61964 for work description for the v26 changes.
          
Separate perf suite results are here
          
ThinLTO: https://github.com/JaneaSystems/node-thin-lto-perf
          
PGO: https://github.com/JaneaSystems/node-pgo-perf
          What is the feature you are proposing to solve the problem?
          Backport the relevant PRs (and related config changes the the build):
          What alternatives have you considered?
          none
          Activity
          Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            feature requestIssues requesting new Node.js features.
            Type
            No type
            Projects
            Milestone
            No milestone
            Relationships
            None yet
            Development
            No branches or pull requests
            Issue actions
            
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

            Skip to content
            Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64) #65452
            Open
            Open
            Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64)#65452
            Labels
            feature requestIssues requesting new Node.js features.
            Description
            @marcpems
            marcpems
            opened on Aug 21, 2026
            What is the problem this feature will solve?
            Improve performance of Windows builds by 15% by backporting the perf improvements brought through PGO and ThinLTO enablement, from v26 to v24 LTS releases.
            See issue #61964 for work description for the v26 changes.
            
Separate perf suite results are here
            
ThinLTO: https://github.com/JaneaSystems/node-thin-lto-perf
            
PGO: https://github.com/JaneaSystems/node-pgo-perf
            What is the feature you are proposing to solve the problem?
            Backport the relevant PRs (and related config changes the the build):
            What alternatives have you considered?
            none
            Activity
            Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
            Metadata
            Metadata
            Assignees
            No one assigned
              Labels
              feature requestIssues requesting new Node.js features.
              Type
              No type
              Projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64) #65452
              Open
              Open
              Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64)#65452
              Labels
              feature requestIssues requesting new Node.js features.
              Description
              @marcpems
              marcpems
              opened on Aug 21, 2026
              What is the problem this feature will solve?
              Improve performance of Windows builds by 15% by backporting the perf improvements brought through PGO and ThinLTO enablement, from v26 to v24 LTS releases.
              See issue #61964 for work description for the v26 changes.
              
Separate perf suite results are here
              
ThinLTO: https://github.com/JaneaSystems/node-thin-lto-perf
              
PGO: https://github.com/JaneaSystems/node-pgo-perf
              What is the feature you are proposing to solve the problem?
              Backport the relevant PRs (and related config changes the the build):
              What alternatives have you considered?
              none
              Activity
              Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                feature requestIssues requesting new Node.js features.
                Type
                No type
                Projects
                Milestone
                No milestone
                Relationships
                None yet
                Development
                No branches or pull requests
                Issue actions
                
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                Skip to content
                Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64) #65452
                Open
                Open
                Backport Windows PGO + ThinLTO from main to v24 LTO builds for builds (x64 and Arm64)#65452
                Labels
                feature requestIssues requesting new Node.js features.
                Description
                @marcpems
                marcpems
                opened on Aug 21, 2026
                What is the problem this feature will solve?
                Improve performance of Windows builds by 15% by backporting the perf improvements brought through PGO and ThinLTO enablement, from v26 to v24 LTS releases.
                See issue #61964 for work description for the v26 changes.
                
Separate perf suite results are here
                
ThinLTO: https://github.com/JaneaSystems/node-thin-lto-perf
                
PGO: https://github.com/JaneaSystems/node-pgo-perf
                What is the feature you are proposing to solve the problem?
                Backport the relevant PRs (and related config changes the the build):
                What alternatives have you considered?
                none
                Activity
                Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                Metadata
                Metadata
                Assignees
                No one assigned
                  Labels
                  feature requestIssues requesting new Node.js features.
                  Type
                  No type
                  Projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions