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Merge pull request #4247 from anvme/perf/tracker-inp-defer-sort

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perf(tracker): defer INP percentile computation to flush time
This commit is contained in:
Francis Cao
2026-05-07 16:57:04 -07:00
committed by GitHub
parent e2fcea65c0 3f9de35907
commit 1b61ee4692
1 changed files with 22 additions and 15 deletions
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src/tracker/index.js
+22 -15
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@@ -292,27 +292,33 @@
// INP - group by interactionId, 98th percentile, 40ms threshold
let interactions = {};
try {
const observer = new PerformanceObserver(list => {
list.getEntries().forEach(entry => {
if (entry.interactionId) {
const existing = interactions[entry.interactionId];
if (!existing || entry.duration > existing) {
interactions[entry.interactionId] = entry.duration;
}
const values = Object.values(interactions).sort((a, b) => b - a);
if (values.length) {
const p98Index = Math.floor(Math.max(values.length, 10) * 0.02);
metrics.inp = values[Math.min(p98Index, values.length - 1)];
}
let inpObserver;
const recordInteractions = entries => {
entries.forEach(entry => {
if (entry.interactionId) {
const existing = interactions[entry.interactionId];
if (!existing || entry.duration > existing) {
interactions[entry.interactionId] = entry.duration;
}
});
}
});
observer.observe({ type: 'event', buffered: true, durationThreshold: 40 });
};
try {
inpObserver = new PerformanceObserver(list => recordInteractions(list.getEntries()));
inpObserver.observe({ type: 'event', buffered: true, durationThreshold: 40 });
} catch {
/* not supported */
}
const computeInp = () => {
if (inpObserver) recordInteractions(inpObserver.takeRecords());
const values = Object.values(interactions).sort((a, b) => b - a);
if (values.length) {
const p98Index = Math.floor(Math.max(values.length, 10) * 0.02);
metrics.inp = values[Math.min(p98Index, values.length - 1)];
}
};
const getEntriesByType = type => {
try {
return window.performance?.getEntriesByType?.(type) || [];
@@ -353,6 +359,7 @@
if (sent) return;
applyFallbackMetrics();
computeInp();
metrics.duration = Math.round(performance.now() - pageStartTime);
sent = true;