SH4 runs smooth for me. Not a single CTD so far, no slowdowns or choppy graphics. Average FPS in the 30s in almost every situation. Enjoying the sim quite a bit!

Waiting for the patch to solve the most annoying bugs. Otherwise, great one!
Win XP pro.
P4 2.8 dual core
2Gb Ram DDR dual channel
ATI X1900XT 512MB
SB Audigy 2