Originally Posted by tisti

Compcache - this creates a virtual compressed RAM swap partition. It takes programs in RAM, compresses them, and then stores them back into the RAM (that 25600 number tells the compcache to use 25MB of ram for itself!). I'd recommend you don't go above 12MB. Better yet, turn it off, phone is much less "laggy".
Cpu sampling: - determines the clock speed of the CPU. I have mine set on Mix, haven't tested performance over the 3 settings though.
SSH server - remote login over WIFI, leave on off unless you know what your doing
Renice - sorts out service/application priorities, gives a nice boost. Leave On.
Provisionned - this one I haven't checked.