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-   -   KDE4 almost unuseable (http://www.nvnews.net/vbulletin/showthread.php?t=109990)

Thindox 03-17-08 04:36 AM

KDE4 almost unuseable

I've just updated my system to a GeForce-8500 and I am experiencing terrible performance problems for desktop applications.

I am running Fedora8 (with latest updates) + KDE4.0.2 + FireFox3B4.
Resizing/Painting performance is especially bad for all KDE4/QT4 applications, GTK is not good but better. FireFox3 has problems when scrolling on webpages that have transparency or a lot of graphical elements, top shows most time is eaten by Xorg.
KDE3/QT3 applications repaint and resize fast without any problems.

Any ideas what could be the problem?

Thx Thindy

txf 03-17-08 08:27 AM

Re: KDE4 almost unuseable
Poor Render acceleration is probably the primary culprit here. Not much you can do about it except wait for nvidia to fix it, or at least accelerate the required render operations (nvidia does not accelerate all render operations AFAIK). One thing I noticed is that kde4 from trunk is a lot more snappy probably due to Qt4.4

Has anyone noticed any speed improvements with different InitialPixmapPlacement values? Oh yeah have you got RenderAccel enabled? Its usually on by default but some distros disable it.

energyman76b 03-17-08 12:35 PM

Re: KDE4 almost unuseable
4.0.X is full with debug code and known to be slow.

Thindox 03-17-08 01:15 PM

Re: KDE4 almost unuseable

4.0.X is full with debug code and known to be slow.
Thats wrong - QT4 is production code (QT4.0 was released years ago), and it does not matter wether I use QT4-only or KDE4 applications. On my Intel-Laptop which has a 945GM with the EXA enabled drivers it runs almost smooth.

Furthermore I can't imagine what debug code should have to do with resizing/repainting windows - because most of the work done there is done by QT4, leaving the KDE4 code almost unused.

Lethe 03-17-08 01:50 PM

Re: KDE4 almost unuseable
Check the Glibc $ENV:




> export | grep -i malloc

to check, but if you run KDE4 it will be set.

KDE4 sets that, and does slow down applications. Whether that applies here or not, I don't know.


ledoc 03-17-08 08:57 PM

Re: KDE4 almost unuseable
I think KDE4 itself is not the problem. I ran one of the beta live CDs inside virtualbox (virtualbox.org) and it felt really snappy. Running it natively (quadro 570m) was waaaay slower. As the OP said, usable, but barely.

txf 03-17-08 10:07 PM

Re: KDE4 almost unuseable
The same applies when running it under a nested xserver like xephyr. Sure you can't any fancy compositing but window drawing is significantly snappier.


Originally Posted by energyman76b
4.0.X is full with debug code and known to be slow.

compiling it without debugging enabled its almost just as slow.

JackieBrown 03-18-08 12:30 AM

Re: KDE4 almost unuseable
It runs as fast as KDE 3 did here (or at least as fast as I remember KDE 3 running.)

I have no lags and I have some composite (or kwin?) effects on.

capthookb 03-18-08 06:18 AM

Re: KDE4 almost unuseable
I tried it with vesa drivers instead of nvidia binary and it was smoother. I also have problems with kde4, but it seems to be nvidia. I don't know if it is text rendering or general 2d performance.

JRepin 06-24-08 10:59 AM

Re: KDE4 almost unuseable
I have the same problem with nVidia and KDE 4.1 Beta 2 here. If I put into the same computer an ATI Radeon 9600 it is a lot smoother than with nVidia GeForce 7600GS.

vampire_donkey 06-24-08 03:46 PM

Re: KDE4 almost unuseable
I don't pretend that this will go any distance towards fixing anything, but the tips I added here made life much more tolerable for me along with the InitialPixmapPlacement=2 GlyphCache=1 stuff.

Gregor A. 06-25-08 12:14 AM

Re: KDE4 almost unuseable

Originally Posted by Thindox (Post 1595674)
Any ideas what could be the problem?

I think the binary nvidia crap is the problem.

Thank You NVIDIA, we have a new KDE4 and with your help, it is unusable....

Many people (Some Vista users) will test the new KDE4.
And the first impression will be: wow this is unbearable slow...

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