I haven't noticed any kind of FPS hit compared to the MD-11, or the 377 Stratocruiser. For awhile I was in a heavy fog and it didn't skip a beat. I actually had to modify the weather to clear myself (which is something I am strongly against, but I did it cause I'd rather clear the weather than crash), because I couldn't find the airport. I do have my frames locked at 20FPS though. I never had any luck using the unlimited setting like other people. Gauges all worked smooth in the VC. Another note on that is that all the panels on the FE station can be brought up in 2D windows. Is definately a complex bird though. I am sure once I spend some time in the manual and on the ground it will become second nature. At one point the MD-11 seemed hard as well, but now it is almost second nature. When I first started out on the 11 I couldn't even use a FMC. Although this aircraft seems to use some kind of coordinate based system that... As far as FPS goes though my system specs are i7-950, ASUS P6T V2 MB, 6GB RAM, Nvidia 285GTX, 750GB HD & 150GB Raptor 10,000RPM (for FSX), and I just use onboard sound. My FSX is setup as suggested by Nick N, and I use Nhancer.