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I do like openSuse though, kudos to them for the great distro.
That said, my thoughts :
* It is something in the graphics department of openSuse. Only gpu/graphics are slow and worse have a little of corruption on them (glitchs sometime appears). I dunno why this happens, simply managing driver and X / Mesa versions is not enough, as opensuse is using a more or less recent X/Mesa/Driver stack.
* Even if its only graphics performance and the rest is very fast ... everything will look horrible slow. No matter how fast the underlying system is running, if displaying / moving / animating a window is slow, it looks like everything is damn slow.
I would really love for openSuse to fix this, as its one of my favorite distros. Problably is something related to my video card model and its rare, so its not getting attention.
In terms of performance and memory usage , KDE is very very good. Actually , since i have a very weird KDE desktop configuration ( systray and menu are on the dashboard ), if kde was slow everything would be ruined ( dashboard does dim screen and blur... and i go there alot of times. if it was slow it would greatly effect my usage ).
Kudos also for the nepomuk and strigi guys. My only grip now is : Why not export tags and ( some , only whats possible ) nepomuk info into files extended attributes. My work and backup partitions are both linux filesystems, so i would never lose any information.