realtime tweak, adding KDE cursors and pasystray
setting 'performance' governor by default, adding CPU power utils
realtime can be guaranteed only with constant frequency, moreover constant maximum CPU frequency is important for video drivers. please, slap anyone who says that performance governor is bad for desktop, like openSUSE maintainers.
there is a danger, of course, for CPUs that behave bad at their maximum even without a load. in such cases you should change /etc/sysconfig/pm-profiler default

http://linuxmusicians.com/viewtopic.php?f=27&t=844&start=15#p13491
http://www.phoronix.com/forums/showthread.php?85610-Here-s-Why-Radeon-Graphics-Are-Faster-On-Linux-3-12&p=364065#post364065
advanced sound config kit for JACK/ALSA/PA interoperability with global stereo equalizer, compression and limitation via jamin
equalizer is set to boost bass & treble, make sure you have your sound devices set to flat output (no hardware filtering)