BuzzbeeSCD/openchamber
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perf(tooling): measure animations in context and at document scale

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Adds fixture variants that keep an identical transform animation and vary only
its surroundings — inside a button, under a filtered, clipped, blurred,
transformed or faded ancestor — plus the repository's own spinner overrides
isolated piece by piece. Adds --filler, which pads the page with static
elements, because a variant that costs nothing on a small page is not proven
free in a real document.

All of them measure zero style recalculations per second, including at 15,000
filler elements, which rules out ancestor context, the custom keyframes,
transform-box and document size as explanations for the cost the same spinner
shows inside the application.
This commit is contained in:
Bohdan Triapitsyn
2026-08-03 18:50:06 +03:00
parent ca31157584
commit 51d814307f
2 changed files with 82 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
scripts/perf/animation-fixture.html
+69 -1
View File
@@ -41,6 +41,56 @@
.v-box-shadow .cell { animation: oc-box-shadow 1.5s linear infinite; }
.v-filter svg { animation: oc-filter 1.5s linear infinite; }
.v-width svg { animation: oc-width 1.5s linear infinite; }
/*
Context variants. The same composited animation can stop being composited
because of an ancestor, so these reproduce the surroundings a spinner
actually lives in. Each keeps the identical transform animation and varies
only the context.
*/
.v-ctx-button .cell svg,
.v-ctx-filter .cell svg,
.v-ctx-overflow .cell svg,
.v-ctx-backdrop .cell svg,
.v-ctx-opacity .cell svg,
.v-ctx-transformed-parent .cell svg,
.v-ctx-sibling-translatez .cell svg,
.v-ctx-currentcolor .cell svg { animation: oc-transform-rotate 1s linear infinite; }
/* Mirrors the repository rule that gives every other button SVG a GPU hint. */
.v-ctx-sibling-translatez button svg:not(.spin) { transform: translateZ(0); }
.v-ctx-filter .cell { filter: brightness(1.05); }
.v-ctx-overflow .cell { overflow: hidden; }
.v-ctx-backdrop .cell { backdrop-filter: blur(2px); }
.v-ctx-opacity .cell { opacity: 0.9; }
.v-ctx-transformed-parent .cell { transform: translateY(1px); }
.v-ctx-currentcolor .cell { color: color-mix(in srgb, #8ab 60%, #345); }
.v-ctx-currentcolor .cell svg { stroke: currentColor; }
/*
The repository's own spinner rules, isolated. The application overrides
Tailwind's animate-spin with these, so each piece is measured separately to
find which one stops the rotation being composited.
*/
@keyframes oc-webkit-spin {
0% { transform: translateZ(0) rotate(0deg); }
100% { transform: translateZ(0) rotate(360deg); }
}
.v-app-keyframes svg { animation: oc-webkit-spin 1s linear infinite; }
.v-app-fillbox svg {
animation: oc-transform-rotate 1s linear infinite;
transform-box: fill-box;
transform-origin: 50% 50%;
}
.v-app-full svg {
animation: oc-webkit-spin 1s linear infinite;
will-change: transform;
transform-box: fill-box;
transform-origin: 50% 50%;
overflow: visible;
display: block;
}
</style>
</head>
<body>
@@ -49,17 +99,35 @@
const SPINNER = '<svg viewBox="0 0 24 24" fill="none" stroke="#8ab" stroke-width="2">'
+ '<circle cx="12" cy="12" r="9" stroke-opacity=".25"/><path d="M21 12a9 9 0 0 0-9-9"/></svg>';
const params = new URLSearchParams(location.search);
// Style recalculation cost depends on how much document there is to walk, so
// a variant that is free on a small page is not proven free in a real one.
const filler = Math.max(0, Number(params.get('filler') || 0));
const variant = params.get('variant') || 'none';
const count = Math.max(1, Number(params.get('count') || 2));
const grid = document.getElementById('grid');
grid.className = 'grid v-' + variant;
const usesWrapper = variant.endsWith('-wrapper');
const usesButton = variant === 'ctx-button' || variant === 'ctx-sibling-translatez';
for (let index = 0; index < count; index += 1) {
const cell = document.createElement('div');
cell.className = 'cell';
cell.innerHTML = usesWrapper ? '<span class="wrap">' + SPINNER + '</span>' : SPINNER;
const spinner = SPINNER.replace('<svg', '<svg class="spin"');
if (usesWrapper) cell.innerHTML = '<span class="wrap">' + SPINNER + '</span>';
else if (usesButton) cell.innerHTML = '<button>' + spinner + '<svg viewBox="0 0 24 24"><circle cx="12" cy="12" r="4" fill="#456"/></svg></button>';
else cell.innerHTML = SPINNER;
grid.appendChild(cell);
}
if (filler > 0) {
const container = document.createElement('div');
container.style.cssText = 'position:absolute;visibility:hidden;pointer-events:none;';
let markup = '';
for (let index = 0; index < filler; index += 1) {
markup += '<div class="filler-row"><span>row ' + index + '</span><em>x</em></div>';
}
container.innerHTML = markup;
document.body.appendChild(container);
}
</script>
</body>
</html>
scripts/profile-animation.mjs
+13 -1
View File
@@ -47,6 +47,14 @@ const DEFAULT_VARIANTS = [
"box-shadow",
"filter",
"width",
"ctx-button",
"ctx-sibling-translatez",
"ctx-filter",
"ctx-overflow",
"ctx-backdrop",
"ctx-opacity",
"ctx-transformed-parent",
"ctx-currentcolor",
]
const HELP = `Usage: bun run profile:animation -- [options]
@@ -58,6 +66,8 @@ Options:
--count <n> Animated elements per variant (default: 2)
--duration <seconds> Measurement window per variant (default: 10)
--settle <seconds> Wait before measuring each variant (default: 3)
--filler <n> Static elements added to the page, to measure a variant
against a realistically sized document (default: 0)
--chrome <path> Chrome/Chromium executable
--profile-dir <path> Reusable isolated Chrome profile
--headed Show the browser (default: headless)
@@ -73,6 +83,7 @@ const parseArgs = (argv) => {
count: 2,
duration: 10,
settle: 3,
filler: 0,
chrome: null,
profileDir: join(homedir(), ".openchamber", "browser-profile-google-chrome"),
headless: true,
@@ -87,6 +98,7 @@ const parseArgs = (argv) => {
else if (value === "--count") options.count = Number(argv[++index])
else if (value === "--duration") options.duration = Number(argv[++index])
else if (value === "--settle") options.settle = Number(argv[++index])
else if (value === "--filler") options.filler = Number(argv[++index])
else if (value === "--chrome") options.chrome = argv[++index]
else if (value === "--profile-dir") options.profileDir = argv[++index]
else throw new Error(`Unknown option: ${value}`)
@@ -170,7 +182,7 @@ const main = async () => {
console.log(`Measuring ${options.variants.length} variants, ${options.count} element(s) each, ${options.duration}s per variant.\n`)
for (const variant of options.variants) {
const url = `http://127.0.0.1:${fixturePort}/?variant=${encodeURIComponent(variant)}&count=${options.count}`
const url = `http://127.0.0.1:${fixturePort}/?variant=${encodeURIComponent(variant)}&count=${options.count}&filler=${options.filler}`
const measured = await measureVariant(client, url, options)
results.push({ variant, ...measured })
if (!options.json) {