all @ 900 Mhz :

crash 3 : PCSX-ReArmed with bios enabled - Frameskip disabled
crash1 : PCSX-ReArmed with bios disabled - Frameskip disabled
crash team racing : PCSX-ReArmed with bios enabled - Frameskip disabled **
Hercules : PSX4m : cycle : disabled - Frameskip : 2 **
Heat of Darkness : PCSX-ReArmed with bios disbled - Frameskip disabled
Tenchu 2 : PCSX-ReArmed with bios enabled - Frameskip disabled

I've read before that in the advanced options its better to check only the last 3 ones (SPU - rootcounter 1 & 2), but i noticed better and faster performance (graphical too) with none checked except for two games i marked them with the blue stars.