Version: (using KDE 4.2.4) OS: Linux Installed from: Debian testing/unstable Packages I'm currently running KDE 3.5.10 from Debian Testing (Squeeze) on an EPIA mini-ITX motherboard with 512MB RAM 1.0 GHz Processor and the onboard VIA CLE266 video chipset. I am still hesitant of switching to KDE4 and one of the problems is that I recently tried running the live CD distribution SIDUX 2009-02 with KDE 4.2.4 and found that it is slower than KDE 3.5.10 with things like moving a window, minimizing and maximizing windows. It just feels and looks like a poor experience because of the slowness. I would like to see speed improvement.
Please note that booting into a live CD might not get the optimum configuration, especially regarding video drivers. If you can install into a separate partition, you might try that.
I agree with Christoph: given your hardware configuration I pretty much doubt you can have a nice experience with any live system. That said: without knowing how a native installation will look like it's difficult to say there is a bug or anything to improve. First of all - if your hardware is capable of doing compositing (desktop effects) you should better disable them as they need a lot of RAM. As you mentioned slow window moving I doubt that your hardware supports compositing. Please also note that the complete KDE architecture has gone a great step with KDE 4. And as it's with everything: there is no such thing as free lunch. When we want to have a nice looking system with so many great features it will require ressources. So it is possible that your system is just too old to run KDE 4 in a smooth environment - I don't know I never have tried KDE 4 on such old hardware and it might be possible.
Improving performance is an ongoing process. I do not see how we can ever implement this feature request.