How did sony perfect software emulation for the ps2?

Question

In such a short amount of time, Pcsx2 however took years to develop and not alot of games work on it at full speed

Answer 1

well I would hardly call 80% playable perfect but pretty good i guess and they left the gpu for ps2 in there so that helps a little pcsx2 is much harder as it has not ps2 part in it so everything must be emu which makes it harder

Answer 2

alot of hard work and try try try again fails,

"if you fail try and try again, thats how people reach there goals" or somthing to that XD