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Chrome Beta Compiles JavaScript In The Background To Improve Speed
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msg:4645171
 12:51 pm on Feb 14, 2014 (gmt 0)

We aim to make Chrome the fastest browser possible. One way V8 helps with this goal is by compiling JavaScript into native machine code to execute scripts quickly. Historically, Chrome compiled JavaScript on the main thread, where it could interfere with the performance of the JavaScript application. In the latest Chrome Beta we've enabled concurrent compilation, which offloads a large part of the optimizing compilation phase to a background thread. The result is that JavaScript applications remain responsive and performance gets a boost. Chrome Beta Compiles JavaScript In The Background To Improve Speed [blog.chromium.org]
By enabling concurrent compilation, V8 still optimizes a large piece of code, but does it in a background thread. Execution continues alongside compilation, providing for a smoother user experience.

 

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