I lost about 10 fps with the patch. Getting between 27 and 85 fps depending upon how many aircraft are nearby and factors such as smoke, proximity to the ground...etc.
However, I'm running 1024 graphics, so that's not too bad I guess. If I run 512, the frame rate should improve, but it's usable as is without major hassle.
System is P-4, 3.0 gig on a ASUS P4P MB
ATI 9600XT, 2 gigs RAM.
My regards,
Widewing