Question: why does pcsx2 run slow?
Answer: Why is PCSX2 slow? Basically, the PS2's got a really complicated hardware (like 2 VU processors and a 128 bit CPU), all of which has to be emulated. ... Enable the speedhacks in the emulation settings and wait, since the emulator is under active development and the day might come when PCSX2 will run any game smoothly ;)