[Interest] Qt 5.0.2 speed and widgets

[Michael Klank]

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!


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Von: interest-bounces+michael.klank=amk-antriebe.de at qt-project.org
[mailto: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.

Иван Комиссаров

14.04.2013, в 21:55, Philippe <philwave at gmail.com> написал(а):

> 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
> 
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