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core: truncate measure timings to hundredths #7748

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merged 2 commits into from
Mar 29, 2019
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core: truncate measure timings to hundredths #7748

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4d1c288
core: truncate measure timings to hundredths
connorjclark Mar 27, 2019
10ba599
add comment, dont modify readonly obj
connorjclark Mar 28, 2019
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11 changes: 10 additions & 1 deletion lighthouse-core/runner.js
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Original file line number Diff line number Diff line change
Expand Up @@ -179,7 +179,16 @@ class Runner {
...timingEntriesFromRunner,
// As entries can share a name, dedupe based on the startTime timestamp
].map(entry => /** @type {[number, PerformanceEntry]} */ ([entry.startTime, entry]));
const timingEntries = Array.from(new Map(timingEntriesKeyValues).values());
const timingEntries = Array.from(new Map(timingEntriesKeyValues).values())
// Truncate timestamps to hundredths of a millisecond saves ~4KB. No need for microsecond
// resolution.
.map(entry => {
return /** @type {PerformanceEntry} */ ({
...entry,
duration: parseFloat(entry.duration.toFixed(2)),
startTime: parseFloat(entry.startTime.toFixed(2)),
});
});
const runnerEntry = timingEntries.find(e => e.name === 'lh:runner:run');
return {entries: timingEntries, total: runnerEntry && runnerEntry.duration || 0};
}
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