The benchmark at http://www.scirra.com/labs/renderperf3/ gets around 142k in Chrome, vs. 66k in Firefox on my box with a 560 Ti. On my work desktop with a faster CPU with a Quadro 2000, they both get around 33k. No idea why Chrome gets such a big win on a faster GPU, but we should figure it out.

Profile: http://people.mozilla.com/~bgirard/cleopatra/#report=9ea4d029e60cbef674355a567cc83bfc71a91b05 View: http://tinyurl.com/cf443cr We spend about 71% of our time in JS. This benchmark would also improve slightly (~5% I'd guess) from using double buffering. My guess is this benchmark needs some JS tuning.

Yep, looks like it. Curious -- I wonder why that's different on my Quadro 2000 box? I guess the 3D cost ends up overriding the JS cost? Moving this to JS. Unfortunately the code is obfuscated, we can probably reach out and get unobfuscated one.