On my machine: Chromium 10.0.604.0 (without Crankshaft): http://krakenbenchmark.mozilla.org/kraken-1.0/results.html?%7B%22v%22:%20%22kraken-1.0%22,%20%22ai-ast

On my machine: Chromium 10.0.604.0 (without Crankshaft): http://krakenbenchmark.mozilla.org/kraken-1.0/results.html?%7B%22v%22:%20%22kraken-1.0%22,%20%22ai-astar%22:%5B915,914,919,918,916,915,911,914,916,914%5D,%22audio-beat-detection%22:%5B1788,1789,1808,1797,1821,1792,1792,1790,1850,1794%5D,%22audio-dft%22:%5B2983,2934,3033,3001,2962,2977,3045,3047,3046,2905%5D,%22audio-fft%22:%5B1754,1730,1728,1767,1764,1761,1754,1755,1756,1733%5D,%22audio-oscillator%22:%5B789,789,830,778,795,797,799,796,798,785%5D,%22imaging-gaussian-blur%22:%5B3707,3726,3728,3676,3666,3724,3692,3680,3674,3705%5D,%22imaging-darkroom%22:%5B2111,2289,2113,2099,2115,2104,2103,2103,2099,2094%5D,%22imaging-desaturate%22:%5B2137,2177,2126,2123,2124,2127,2125,2131,2158,2126%5D,%22json-parse-financial%22:%5B290,287,289,289,291,286,289,290,288,289%5D,%22json-stringify-tinderbox%22:%5B263,266,264,263,266,266,265,266,266,263%5D,%22stanford-crypto-aes%22:%5B178,175,176,177,178,177,177,178,178,175%5D,%22stanford-crypto-ccm%22:%5B143,143,143,143,142,142,142,142,143,141%5D,%22stanford-crypto-pbkdf2%22:%5B354,347,356,338,333,331,331,344,331,332%5D,%22stanford-crypto-sha256-iterative%22:%5B143,143,144,142,143,143,142,145,142,142%5D%7D http://krakenbenchmark.mozilla.org/kraken-1.0/results.html?%... Firefox/4.0b8pre from 20101208: http://krakenbenchmark.mozilla.org/kraken-1.0/results.html?%7B%22v%22:%20%22kraken-1.0%22,%20%22ai-astar%22:%5B1387,1388,1356,1416,1426,1387,1435,1392,1420,1392%5D,%22audio-beat-detection%22:%5B981,785,866,875,846,850,878,871,875,846%5D,%22audio-dft%22:%5B773,865,740,729,725,722,734,726,714,720%5D,%22audio-fft%22:%5B691,674,671,669,686,667,668,665,669,675%5D,%22audio-oscillator%22:%5B620,620,618,621,625,617,620,620,621,633%5D,%22imaging-gaussian-blur%22:%5B809,805,7072,812,805,804,807,807,805,808%5D,%22imaging-darkroom%22:%5B325,323,323,327,326,324,325,325,326,326%5D,%22imaging-desaturate%22:%5B878,868,857,858,868,865,870,869,874,879%5D,%22json-parse-financial%22:%5B181,176,177,175,177,174,176,179,186,179%5D,%22json-stringify-tinderbox%22:%5B92,93,92,93,91,91,92,92,92,91%5D,%22stanford-crypto-aes%22:%5B364,369,368,363,363,367,370,366,367,367%5D,%22stanford-crypto-ccm%22:%5B228,228,227,228,226,227,229,226,228,226%5D,%22stanford-crypto-pbkdf2%22:%5B503,473,477,477,480,475,475,481,486,481%5D,%22stanford-crypto-sha256-iterative%22:%5B203,203,203,203,203,201,203,201,203,203%5D%7D http://krakenbenchmark.mozilla.org/kraken-1.0/results.html?%... Overall, Firefox is 2.08x faster. Ubuntu 10.10 x86_64, on a Core 2 Duo 2.4GHz Comparing these with your results, it sounds like the JS performance war just got interesting again.