Created
August 16, 2016 17:05
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key RUM perf metric: time-to-first-jank
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| 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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