[Qt] Lazarus running slow on KDE 4.6.2

[Steven Feinstein]

I have an ATI Radeon.  Running with Windows style is better than plastique and oxygen, but very ugly.  Plastique is usable at least.  But strange behavior.  Apps I build using QT do not seem to have any X problems when they run.  They never exceed 15% in top.  It's just Lazarus itself.

--- On Sat, 4/9/11, zeljko <zeljko at holobit.net> wrote:

> From: zeljko <zeljko at holobit.net>
> Subject: Re: [Qt] Lazarus running slow on KDE 4.6.2
> To: "Items specific to the Qt widget set" <qt at lists.lazarus.freepascal.org>
> Date: Saturday, April 9, 2011, 2:54 AM
> On Saturday 09 of April 2011 03:25:14
> Steven Feinstein wrote:
> > I use PCLinuxOS.  Up to date with:
> > QT: 4.7.2
> > KDE: 4.6.2
> > 
> > I run Lazarus from the latest SVN build.  In my
> case it is 30245.
> > 
> > Just recently (builds for the last few weeks), I've
> run into a problem. 
> > Lazarus runs extremely slowly if I build using
> OPT="-dQT_NATIVE_DIALOGS"
> > LCL_PLATFORM=qt.  Using top, X jumps to 70-90%
> whenever I try to do
> > something in the IDE related to the UI.  If I do
> not use components (say a
> > console application) the IDE runs fine.
> > 
> > I recompiled using GTK and the IDE runs fine as
> well.  I played around with
> > desktop Styles.  If I use the Oxygen theme (which
> I do), it is terrible. 
> > X jumps to 70-90%.  Which makes Lazarus
> unusable.  If I change to
> > Plastique, X jumps only to 40-50%.  Which makes
> Lazarus mostly usable but
> > slow.
> > 
> > GTK, X jumps 10-15% at most.
> > 
> > I posted on the Lazarus forum and no one else seemed
> to have this issue. 
> > They suggested posting here.
> > 
> > Hopefully someone will have an idea of what setting
> might be messing me up.
> 
> I have no idea why it is so ... it runs fine here,
> qt-4.7.2, KDE-4.6.2 (Fedora 
> 14 32 bit)+ remote X lazarus with qt-4.6.3 on KDE-3.5
> (Fedora 3) runs fine 
> also. Oxygen can slow down things, but it's weird that
> plastique is doing the 
> same. 
> You can try to start lazarus from console with windows
> style and see if it's 
> better, eg.
> cd /to/your/lazarus/dir
> ./lazarus -style windows
> 
> What's your graphic card and driver ? Qt have problems with
> nvidia cards 
> sometimes, but also I've seen problems with intel cards in
> combination with 
> old intel drivers. If it's so, try vesa graphic driver and
> see if it's still 
> slow.
> 
> zeljko
> 
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