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PerformanceDemo

Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.

Perf Demo

This is the main app, showing a few options to simulate different performance issues.

Keep Busy app

Simple app to keep the CPU busy. Useful to test how other processes affects your app, and more. Currently, the app creates 4 threads and takes about ~8 seconds to complete. You can play with the values in the service to tweak that. Running the process is possible through the adb command:

adb shell am broadcast -a com.udinic.keepbusyapp.ACTION_KEEP_BUSY

Note: you must open the app's activity at least once before that, due to Android security measures to prevent apps from responding to broadcasts before opening the app for the first time.

About

Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.

Resources

Readme
MIT license
Activity

Stars

121 stars

Watchers

5 watching

Forks

13 forks
Report repository

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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
BranchesTags
Repository files navigation
PerformanceDemo
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Perf Demo
This is the main app, showing a few options to simulate different performance issues.
Keep Busy app
Simple app to keep the CPU busy. Useful to test how other processes affects your app, and more.
Currently, the app creates 4 threads and takes about ~8 seconds to complete. You can play with the values in the service to tweak that.
Running the process is possible through the adb command:
adb shell am broadcast -a com.udinic.keepbusyapp.ACTION_KEEP_BUSY

Note: you must open the app's activity at least once before that, due to Android security measures to prevent apps from responding to broadcasts before opening the app for the first time.
About
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Resources
Readme
MIT license
Activity
Stars
121 stars
Watchers
5 watching
Forks
13 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
Repository files navigation
PerformanceDemo
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Perf Demo
This is the main app, showing a few options to simulate different performance issues.
Keep Busy app
Simple app to keep the CPU busy. Useful to test how other processes affects your app, and more.
Currently, the app creates 4 threads and takes about ~8 seconds to complete. You can play with the values in the service to tweak that.
Running the process is possible through the adb command:
adb shell am broadcast -a com.udinic.keepbusyapp.ACTION_KEEP_BUSY

Note: you must open the app's activity at least once before that, due to Android security measures to prevent apps from responding to broadcasts before opening the app for the first time.
About
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Resources
Readme
MIT license
Activity
Stars
121 stars
Watchers
5 watching
Forks
13 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
Repository files navigation
PerformanceDemo
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Perf Demo
This is the main app, showing a few options to simulate different performance issues.
Keep Busy app
Simple app to keep the CPU busy. Useful to test how other processes affects your app, and more.
Currently, the app creates 4 threads and takes about ~8 seconds to complete. You can play with the values in the service to tweak that.
Running the process is possible through the adb command:
adb shell am broadcast -a com.udinic.keepbusyapp.ACTION_KEEP_BUSY

Note: you must open the app's activity at least once before that, due to Android security measures to prevent apps from responding to broadcasts before opening the app for the first time.
About
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Resources
Readme
MIT license
Activity
Stars
121 stars
Watchers
5 watching
Forks
13 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
Repository files navigation
PerformanceDemo
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Perf Demo
This is the main app, showing a few options to simulate different performance issues.
Keep Busy app
Simple app to keep the CPU busy. Useful to test how other processes affects your app, and more.
Currently, the app creates 4 threads and takes about ~8 seconds to complete. You can play with the values in the service to tweak that.
Running the process is possible through the adb command:
adb shell am broadcast -a com.udinic.keepbusyapp.ACTION_KEEP_BUSY

Note: you must open the app's activity at least once before that, due to Android security measures to prevent apps from responding to broadcasts before opening the app for the first time.
About
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Resources
Readme
MIT license
Activity
Stars
121 stars
Watchers
5 watching
Forks
13 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
Repository files navigation
PerformanceDemo
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Perf Demo
This is the main app, showing a few options to simulate different performance issues.
Keep Busy app
Simple app to keep the CPU busy. Useful to test how other processes affects your app, and more.
Currently, the app creates 4 threads and takes about ~8 seconds to complete. You can play with the values in the service to tweak that.
Running the process is possible through the adb command:
adb shell am broadcast -a com.udinic.keepbusyapp.ACTION_KEEP_BUSY

Note: you must open the app's activity at least once before that, due to Android security measures to prevent apps from responding to broadcasts before opening the app for the first time.
About
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Resources
Readme
MIT license
Activity
Stars
121 stars
Watchers
5 watching
Forks
13 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
Repository files navigation
PerformanceDemo
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Perf Demo
This is the main app, showing a few options to simulate different performance issues.
Keep Busy app
Simple app to keep the CPU busy. Useful to test how other processes affects your app, and more.
Currently, the app creates 4 threads and takes about ~8 seconds to complete. You can play with the values in the service to tweak that.
Running the process is possible through the adb command:
adb shell am broadcast -a com.udinic.keepbusyapp.ACTION_KEEP_BUSY

Note: you must open the app's activity at least once before that, due to Android security measures to prevent apps from responding to broadcasts before opening the app for the first time.
About
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Resources
Readme
MIT license
Activity
Stars
121 stars
Watchers
5 watching
Forks
13 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
Repository files navigation
PerformanceDemo
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Perf Demo
This is the main app, showing a few options to simulate different performance issues.
Keep Busy app
Simple app to keep the CPU busy. Useful to test how other processes affects your app, and more.
Currently, the app creates 4 threads and takes about ~8 seconds to complete. You can play with the values in the service to tweak that.
Running the process is possible through the adb command:
adb shell am broadcast -a com.udinic.keepbusyapp.ACTION_KEEP_BUSY

Note: you must open the app's activity at least once before that, due to Android security measures to prevent apps from responding to broadcasts before opening the app for the first time.
About
Simple demonstrations of performance issues. Using these examples will allow practicing performance analyzing tools, such as Systrace, Traceview and more.
Resources
Readme
MIT license
Activity
Stars
121 stars
Watchers
5 watching
Forks
13 forks
Report repository
Releases
Packages
Contributors
Languages