SunSpider is a JavaScript benchmark, probably one of the oldest ones around. We ran version 1.0.2, the most current one available.
For this benchmark, a lower number is better.
Chrome started off OK:
Firefox was a tad faster:
Edge destroyed them both, finishing in less than half the time:
This is an old test, but every time I run it, the latest browsers manage to shave off a few more milliseconds.