Browser Support • Re: Measuring JavaScript execution time

The limited precision in JavaScript is entirely on purpose for security reasons. Multiple side-channel attacks exist that could use high-accuracy timers. Currently, we clamp performance timers to a granularity of 2 ms. See https://xref.palemoon.org/goanna-centra ... amping.cpp Depending on what you're trying to measure, you might also be limited to the refresh driver ticking over which would explain the 16 ms (which is ~60 Hz)