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I second that vote for OpenSUSE on workstations. I was using Fedora for years but I got tired of dealing with the aggressive development pace. Now, OpenSUSE does the job for me and does it well (except lack of performance and KDE being a big fat pig).
can you describe you performance problem?
The system is generally slow.
Slow boot, slow application response, slow desktop response, YAST modules are slow (no surprise), and sometimes there is a keyboard delay. The system feels sluggish in just about every way. I could switch to XFCE and that would likely solve several of the speed issues but I want a full featured desktop environment so I deal with KDE sucking.