SH4 blues

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Ok. So here's my one negative post about SH4.
I played a patrol last night. Things ran silky smooth.
Geforce 6800ultra
Pent.4 3.6GHz
2GB ram
No mods
I did the CTRL+ALT+DEL thing to free up some space and things couldnt be happier.
Today when I goto play, it runs horribly! I cant get more than 512x time compression. It's almost as if my computers processor has a cold.
What in the world is up with this game?!?!?!?
ARRRGH!!!!!!!!!!!!!!!!