Im not really sure, personally ive never tried a ps2 emulator (im more into older consoles like 64, snes, psx, etc) but have you tried disabling the soud? That helps on my epsxe, and Desmume (ds). Also, dl the newest drivers for you gfx card, and update directx (unless you have most current version, i think 10 is newest for win7). Other than that, its your processor. However, dont accept this/these answers immediately, let a few other, more experienced, members give their input as well.