Comment #8 on issue 1840 by [email protected]: High num of deopts for attached production code from game engine
http://code.google.com/p/v8/issues/detail?id=1840
To clarify the XMLHttpRequest issue a bit: If I see things correctly, newer Chrome builds (including M18/canary) contain the change https://bugs.webkit.org/show_bug.cgi?id=72154. You can still do synchronous requests (although they are discouraged by most/all browser vendors), but you can't use new features then, like using an arraybuffer responseType.
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