Linked by Thom Holwerda on Fri 8th May 2009 09:41 UTC, submitted by lemur2
KDE It slipped by us, but the KDE team has released another minor bugfix release of KDE 4.2, version 4.2.3, a few days ago. Being a bugfix release, there are few user-visible changes, but still, there are a few things that stand out. "Online IMAP filtering in KMail has been fixed, KMail's system tray icon now reacts to changes to folder properties and updates the number of emails shown there automatically, and bugfixes, performance improvements and optimization in KHTML - painting and interoperability with web standards has been further improved."
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siride
Member since:
2006-01-02

I have a card that runs Compiz just fine and xcompmgr/kompmgr blazingly fast, but KDE4 is PAINFULLY slow. Every time I try it, it's still slow. I don't need to upgrade my hardware, they need to fix whatever crap they are doing that slows everything down. Heck, even without compositing enabled on KDE4, things are still slow, even apps that weren't laggy while running KDE3. I don't even know how they manage that.

And Qt4 is much slower than Qt3. With Qt3, I can smoothly resize windows both with and without compositing enabled. With Qt4, even without compositing, resizing windows is glacially slow and you can see the widgets struggle to re-lay themselves out. It's pathetic, really.

Reply Parent Score: -1

SlackerJack Member since:
2005-11-12

Amazing how you assume it's KDE4's/Qt4's fault rather than KDE's new tech exposing bugs in the lower stack.

Get the hardware drivers updated to suit the new tech, Nvidia 170.xx series were slow as hell and I can imagine others are too. If hardware drivers don't update to accelerate Qt4 properly then it's going to be slow.

Reply Parent Score: 5

siride Member since:
2006-01-02

I'm not sure what Qt4 is doing that requires mondo graphics cards and drivers, because I certainly can't see it. And it doesn't matter which backend I use: OpenGL, Raster or regular/XRender -- it's still slow. So clearly it must be finding the most inefficient and least likely to be supported way of doing stuff that was already fast before. I don't see how that's an improvement.

Reply Parent Score: 2

tyrione Member since:
2005-11-21

Amazing how you assume it's KDE4's/Qt4's fault rather than KDE's new tech exposing bugs in the lower stack.

Get the hardware drivers updated to suit the new tech, Nvidia 170.xx series were slow as hell and I can imagine others are too. If hardware drivers don't update to accelerate Qt4 properly then it's going to be slow.


Not all Nvidia hardware is supported in the 180.xxx branch of their driver.

So people either have to upgrade their GPU or pass on KDE4.

Reply Parent Score: 2

lemur2 Member since:
2007-02-17

I have a card that runs Compiz just fine and xcompmgr/kompmgr blazingly fast, but KDE4 is PAINFULLY slow. Every time I try it, it's still slow. I don't need to upgrade my hardware, they need to fix whatever crap they are doing that slows everything down. Heck, even without compositing enabled on KDE4, things are still slow, even apps that weren't laggy while running KDE3. I don't even know how they manage that.

And Qt4 is much slower than Qt3. With Qt3, I can smoothly resize windows both with and without compositing enabled. With Qt4, even without compositing, resizing windows is glacially slow and you can see the widgets struggle to re-lay themselves out. It's pathetic, really.


If you have a nvidia card, that is probably the cause of it. Nvidia graphics drivers for Linux have been very broken for over two years, and it was fixed only recently. If you have a nvidia card, then unless you have updated the nvidia drivers for Linux in the last couple of months, that is almost certainly it.

KDE4 is very fast ... PROVIDED that you have properly working hardware-accelerated graphics.

Reply Parent Score: 2

siride Member since:
2006-01-02

I have a Radeon card whose driver is supposedly done.

Reply Parent Score: 2

Krul Member since:
2009-01-29

I have a card that runs Compiz just fine and xcompmgr/kompmgr blazingly fast, but KDE4 is PAINFULLY slow.


Compiz and Kwin use different methods to do hardware acceleration, so having one working does not guarantee that the other one is going to work. There is a lot written on the web about how to solve Kwin performance issues, just google around, or you could at least tell us what graphic card and drivers you are using so that we can try to help you.

Reply Parent Score: 1

siride Member since:
2006-01-02

I have a Radeon Mobility X300 in a ThinkPad T43. It uses the r300 driver which hasn't seen much work lately because, as I understand it, there's not much left to do.

Reply Parent Score: 2