I assume the JS code generated here is using heavily the asm.js subset, so it can be run faster on asm.js-capable browsers. Therefore V8 is not the ideal platf

I assume the JS code generated here is using heavily the asm.js subset, so it can be run faster on asm.js-capable browsers. Therefore V8 is not the ideal platform for benchmarking this implementation. You could try with a nightly Firefox. EDIT: Indeed, 8 MFLOPS on FF Aurora, 1.2 MFLOPS in Chrome Canary.