Now about the SD cache: what's the recommended size to the SD cache? Will it increase performance or something?
I have a 256Mb model. Should I wipe everything, partition the SD Card, then reinstall the ROM from scratch or it will suffice to backup everything, partition the SD Card and then restore?
Are you referring to read ahead? Default is 1024, if I'm not wrong, I've changed it to 128 on my Chinese v880 and noticed faster loadings in gallery, but you need to try it yourself. Just change it and reboot.