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junosuarez/firstJank.js

Created August 16, 2016 17:05
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key RUM perf metric: time-to-first-jank
Raw
firstJank.js
if (window.requestAnimationFrame) {
function checkForJank () { // eslint-disable-line no-inner-delcarations
const frameStart = Date.now()
window.requestAnimationFrame(() => {
const frameDuration = Date.now() - frameStart
if (frameDuration > 17) {
Perf.log(FirstJank)
} else {
checkForJank()
}
})
}
checkForJank()
}
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via https://twitter.com/rauchg/status/765405512401756163

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