Hi patrik,
i've tryed your CyberGraphX settings and, at least here i have a 5-6% of CPU in use even without do nothing.
Resetted my original settings and now about 0% cpu !?!? (as should be)
really weird don't you?
Try with a CPU meter if you have ~0% of CPU usage after a fresh boot.
Consider that i have 2 GFX card installed.
I have in Enviroment: (differen than yours)
SaveMem>ON
AlertEMU>ON
KeepAmigaVideo>ON (probably this is the cause)
56KhzAUDIO>ON
and Tooltypes as yours.
Ciao :-)