[Webkit-unassigned] [Bug 146448] JavaScriptCore performance is very bad on Windows

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=146448

--- Comment #54 from Anders Carlsson <andersca at apple.com> ---
(In reply to comment #53)
> Hmm, I noticed that std::mutex::lock() and std::mutex::unlock() spent about
> 20% of the total time, and tried replacing the std::mutex in JSLock with
> WTF::Mutex. WTF::Mutex::lock() and WTF::Mutex::unlock() then spent about 10%
> of the total time, and the sprite count went from ~4400 to ~6000. So it
> seems the MSVC implementation of std::mutex is not as fast as it could be.

Again, are you testing with VS2015?

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