[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 #51 from peavo at outlook.com ---
(In reply to comment #47)
> 
> We can fix (1) by not taking the JSLock just to answer trivial type checking
> questions. (Similarly, we probably should not take the JSLock just to create
> trivial types like null.)
> 

I tested removing locking in the trivial cases, and the sprite count increased from ~3000 to ~4400 :) (without changing the rest of the patch)
Profiling now shows that JSValueToNumber and JSValueToObject is spending ~20% of the total time taking and releasing the lock. I assume we need to lock in these cases?

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