Dromaeo: JavaScript Performance Testing (via) This is one classy benchmark. Run it in as many browsers as you like (each run is saved to the server and assigned a run ID), then compare the results by appending ?id=[run1],[run2]... to the URL.
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Actually, this benchmark is not fair at all. JavaScript libraries have a different code path for each browser. So this benchmark is not testing the same stuff in each browser.
It's a good idea to benchmark DOM performance but not this way.
Very good point. It would be nice if John provided the option to show just the benchmarks which don't have any browser-specific branches in them. I imagine that would be very easy for him to do.