Qt4 gui performance

[Luciano Montanaro]

Il Friday 29 June 2007 17:56:29 Tobias Koenig ha scritto:
> Hi,
>
> I just wanted to ask whether somebody else have the same feeling that
> Qt4 applications are recognizable slower in painting windows and widgets
> than Qt3 applications.

At times, but it depends from the application.

>
> When I start the KDE3 desktop on my machine here it doesn't fly, however
> you can work fluently. Using the KDE4 desktop is however noticable
> slower, when you resize a window you can follow the rearrangement of the
> gui elements. So using KDE4/Qt4 atm is not really fun.
>
> Is this caused by the Qt build with debug support? Or are the styles not
> ported to the new paint system yet? Can anybody with deeper knowledge
> comment on this?
>

That may be an explanation. Another one may be that now widgets are double 
buffered by default, which introduces some lag.

Luciano