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Aug232008

JIT JavaScript in Firefox for JS performance boost

Mozilla is leveraging an impressive new optimization technique to bring a big performance boost to the Firefox JavaScript engine. The code was merged today (but is not yet ready to be enabled by default in the nightly builds) and is planned for inclusion in Firefox 3.1, the next incremental update of the open-source web browser.

Mozilla just let the cat out of the bag on their new TraceMonkey project. Brendan Eich, Mozilla’s CTO, describes it thusly:

I’m extremely pleased to announce the launch of TraceMonkey, an evolution of Firefox’s SpiderMonkey JavaScript engine for Firefox 3.1 that uses a new kind of Just-In-Time (JIT) compiler to boost JS performance by an order of magnitude or more. [Emphasis ours.]

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