Firefox 18 alpha features IonMonkey, a huge step forward for Mozilla's JavaScript performance and compiler architecture.
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On the Kraken benchmark, Firefox 17 runs in 2602ms, whereas Firefox 18 runs in 1921ms, making for roughly a 26% performance improvement.
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On Google's V8 benchmark, Firefox 15 gets a score of 8474, and Firefox 17 gets a score of 9511. Firefox 18, however, gets a score of 10188, making it 7% faster than Firefox 17, and 20% faster than Firefox 15.
Download Firefox 18 Alpha - Source
On the Kraken benchmark, Firefox 17 runs in 2602ms, whereas Firefox 18 runs in 1921ms, making for roughly a 26% performance improvement.
On Google's V8 benchmark, Firefox 15 gets a score of 8474, and Firefox 17 gets a score of 9511. Firefox 18, however, gets a score of 10188, making it 7% faster than Firefox 17, and 20% faster than Firefox 15.
Download Firefox 18 Alpha - Source