[Webkit-unassigned] [Bug 38386] [Qt] QWebView::load performance issue on Windows compared to Linux

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=38386





--- Comment #18 from Jocelyn Turcotte <jocelyn.turcotte at nokia.com>  2010-05-10 01:47:47 PST ---
(In reply to comment #16)
> Hum, not, that is not a correct profile.
> Jocelyn, what do you use on Windows?
> 
I couldn't get any decent profiler work with webkit on my windows 7 64 machine without crashing. I should try again with JIT disabled some day.
I ended up using poor man sampling profilers like VerySleepy or ProcessMonitor.

(In reply to comment #0)
The problem is that Windows fonts contains OpenType layout information and they don't on Linux. When a font of this type is encountered a different path is taken in text rendering taking near twice as much time.

I don't know if any mandatory process is done in this path for regular fonts like Arial on Windows. Maybe it would be possible to skip it in some case even if the font reports supporting it.

Implementing in QtWebKit the "fast path" for regular ascii files that other ports did would also help, however this can't be done short term.

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