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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - JavaScriptCore performance is very bad on Windows"
href="https://bugs.webkit.org/show_bug.cgi?id=146448#c54">Comment # 54</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - JavaScriptCore performance is very bad on Windows"
href="https://bugs.webkit.org/show_bug.cgi?id=146448">bug 146448</a>
from <span class="vcard"><a class="email" href="mailto:andersca@apple.com" title="Anders Carlsson <andersca@apple.com>"> <span class="fn">Anders Carlsson</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=146448#c53">comment #53</a>)
<span class="quote">> 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.</span >
Again, are you testing with VS2015?</pre>
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