With RH 6.0 sometimes (maybe 1 time on 3) X takes 10 seconds more to start (during these 10 seconds there's no disk activity). It happens with any window manager and I've seen it on 4 computers (they all use the SVGA server). It's not a very severe bug, but's really annoying (usually X takes only 3 or 4 seconds to start, why sometimes it has to take 13 or 14?). If you press ctrl+alt+backspace during the "slow" start and then restart X, usually it start "fast". It happens with any user on my system.
*** This bug has been marked as a duplicate of 2402 ***