[Interest] Qt 5.0.2 speed and widgets

[Philippe]

Sure about it, and yes I will post an issue in Jira. The good news is also that in Release mode, I see no difference of speed at all with 4.8.3.

I will make tests on Mac too.

Philippe

On Mon, 15 Apr 2013 13:33:17 +0200
William Hallatt <goblincoding at gmail.com> wrote:

If you're sure about it, please log a bug explaining what you've done  :)
> 
> 
> 
> On 15 April 2013 10:34, Philippe <philwave at gmail.com> wrote:
> I think I have found the problem: the qaccessible interface...
>> 
>> While my program was kind of hanging during those long seconds, I have
>> broken several times in the debugger, and saw that some accessibility
>> code was being executed. Then I did this quick Qt change:
>> in qaccessible.cpp
>> QAccessible::queryAccessibleInterface(...)
>> I insert "return 0;" at the start...
>> et voilà, back to normal speed! (actually, a 20% reduction compared to
>> 4.8, but this is the day and night compared to before).
>> This code change is a dirty hack of course, but it simply make Qt 5 usable
>> again for me...
>> 
>> There is definitly something wrong on the Windows accessibility code...
>> 
>> Philippe
>> 
>> On Mon, 15 Apr 2013 07:45:55 +0200
>> "Michael Klank" <michael.klank at amk-antriebe.de> wrote:
>> 
>> > We have a similar problem here. I did compare a small (bigxml) program from
>> > http://qt-project.org/ which reads an xml file in a QTreeWidget and expands all
>> > nodes. The test xml file is 2MB. Qt5.0.2 MSVC2012 64Bit/32Bit is up to 20x
>> > slower than Qt4.8.0 MSVC2010 32Bit, in release mode!!! That's strange. And I
>> > didn't say anything from debug mode!
>> >
>> >
>> > -----Ursprüngliche Nachricht-----
>> > Von: interest-bounces+michael.klank=amk-antriebe.de at qt-project.org
>> > [mailto:<mailto:interest-bounces%2Bmichael.klank>interest-bounces+michael.klank=amk-antriebe.de at qt-project.org] Im
>> > Auftrag von ???? ??????????
>> > Gesendet: Sonntag, 14. April 2013 20:14
>> > An: Philippe
>> > Cc: interest at qt-project.org
>> > Betreff: Re: [Interest] Qt 5.0.2 speed and widgets
>> >
>> > Yes, we are having same problem here. Same setup, AFAIK.
>> >
>> > Don't know what's causing problem.
>> >
>> > Also, Mac OS has no noticeable speed regressions, it seems Windows-specific
>> > issue.
>> >
>> 
>> > ???? ??????????
>> >
>> > 14.04.2013, ? 21:55, Philippe <philwave at gmail.com> ???????(?):
>> >
>> > > Compared to Qt 4.8.x, I experiment a very sensible reduction of speed
>> > > in 5.0.2 when widgets are created or complex windows activated.
>> > > In Release mode this is "sort of acceptable",... maybe half speed.
>> > > But in debug mode, this is dramatically slower, up to 6x slower than
>> > > in 4.8.3.
>> > >
>> > > This is not a painting issue as the speed inside a window has been
>> > > measured to be sensibly the same to 4.8.x (using ANGLE).
>> > >
>> > > Anyone else sees the same? Any known reason for this?
>> > >
>> > > Setup: Windows 7, Visual 2010, Qt 32 bit, *very* fast computer.
>> > >
>> > > Philippe
>> > >
>> > _______________________________________________
>> > Interest mailing list
>> > Interest at qt-project.org
>> > http://lists.qt-project.org/mailman/listinfo/interest
>> 
>> 
>> _______________________________________________
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>> 
>> 




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