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$ curl repovive.com/roadmaps/javascript/browser-apis/performance-api

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$ curl repovive.com/roadmaps/javascript/browser-apis/performance-api

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Performance API - Browser APIs | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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Performance API

Measure performance

The Performance API measures how long operations take:

performance.mark("start");
// ... do work ...
performance.mark("end");

performance.measure("work", "start", "end");
const measure = performance.getEntriesByName("work")[0];
console.log(measure.duration); // milliseconds

Use this to find and fix performance bottlenecks.