Mozilla is leveraging an impressive new optimization technique to bring a big performance boost to the Firefox JavaScript engine. They are "getting ready to take JavaScript performance into the next tier" with a radically innovative optimization tactic called tracing that has already produced performance improvements ranging between 20 and 40 times faster in some cases. 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.
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