kde 4.10.2 nvidia, but desktop effects are disabled (I saw some reports related to this) When attempting to adjust volume, pressing volume up/down buttons is often extremely slow to respond. Often plasma will appear on screen and remain permanently. Right click on kmix plasma often takes extremely long to respond. I don't think this was true on kde 4.10.1 (but you never know, could be due to some other 'upgrade') Reproducible: Sometimes
It generally gets slower due to (apparently oxygen-related) kmix memory leak, bug #309464 *** This bug has been marked as a duplicate of bug 309464 ***