Bug 34501

Summary: [Qt] Poor Performance of QtWebKit layouting on Mac
Product: WebKit Reporter: Justin Camerer <jcamerer>
Component: PlatformAssignee: Benjamin Poulain <benjamin>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: benjamin
Priority: P2 Keywords: Performance, Qt
Version: 528+ (Nightly build)   
Hardware: Mac (Intel)   
OS: OS X 10.6   
URL: http://gist.github.com/raw/288082/95eb31e911d2a8e531c5d8561a17a62814c05bce/scrolltable.htm
Bug Depends on: 31719    
Bug Blocks:    
Attachments:
Description Flags
tarball of some profiling output of webkit vs qtwebkit none

Justin Camerer
Reported 2010-02-02 13:26:04 PST
Created attachment 47971 [details] tarball of some profiling output of webkit vs qtwebkit In comparison to Safari or Chrome, QtWebKit is incredibly slow in a few areas. The main problems are: * Scroll speed (causes dom manipulation in this example) * Window resizing * CSS resizable columns of from “resize: horizontal” I am attempting to create a cross platform application that depends on these working smoothly. Have these problems surfaced before?
Attachments
tarball of some profiling output of webkit vs qtwebkit (13.44 MB, application/x-gzip)
2010-02-02 13:26 PST, Justin Camerer 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Benjamin Poulain
Comment 1 2010-03-06 09:19:54 PST
* Scroll speed (causes dom manipulation in this example) This is a known issue. On Mac, with Qt, the scroll() function does not blit the pixels, it forces a full repaint of the view. This is not a WebKit issue, and the developers of Qt are aware of the problem. You can try to render the web page with OpenGL. OpenGL always do full update, but the speed of rendering should compensate. * Window resizing * CSS resizable columns of from “resize: horizontal” These are layouting problems. I did not know there was an issue on Mac, some profiling will be needed.
Benjamin Poulain
Comment 2 2010-04-27 04:15:24 PDT
*** This bug has been marked as a duplicate of bug 38179 ***
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