fix ajax timing calculation #35
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ajax timings are derived from `event.timeStamp` values. latest browser improvements in anti-fingerprinting measures made APIs return timestamps with reduced time precision. calculating timings with those values with `new Date().getTime()` will blow up because it returns a different precision value. the solution is to use `performance.now()` in place of `Date()` https://developer.mozilla.org/en-US/docs/Web/API/Event/timeStamp https://developer.mozilla.org/en-US/docs/Web/API/DOMHighResTimeStamp https://developer.mozilla.org/en-US/docs/Web/API/Performance/now should resolve peek#33 should resolve peek#25
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ajax timings are derived from
event.timeStampvalues. latest browser improvements in anti-fingerprinting measures made APIs return timestamps with reduced time precision. calculating timings with those values withnew Date().getTime()will blow up because it returns a different precision value. the solution is to useperformance.now()in place ofDate()https://developer.mozilla.org/en-US/docs/Web/API/Event/timeStamp https://developer.mozilla.org/en-US/docs/Web/API/DOMHighResTimeStamp https://developer.mozilla.org/en-US/docs/Web/API/Performance/now
should resolve #33
should resolve #25
possibly breaking change for older browsers. do we care about those?