I'm getting a significant drop in fps when I turn on the nav and strobe lights. I go from 30-35 fps down to 19 in a heartbeat. I'm on an old G5, but it's pretty gutsy for an old girl. 2.3ghz dual, Nvidia 7800GT with 256 VRAM, 6 gigs RAM. Have pixel shaders off, which helps a lot. Flies beautifully without lights on, though. Just have to stay VFR It could very well be my machine. Just seems odd that only the lights do it. Seems like such a simple thing.