Yup, LOMAC is CPU-limited in most cases. I've been running some missions lately on a P4 3.0E @ 3.6Ghz and a 6800GT @ Ultra speeds, and found that while the GT does help in some cases (vs. my old Radeon 9700 Pro), especially with overcast and heat blur (both are very GPU-intensive), most everything else is CPU-limited, especially terrain and object rendering. For example, just changing my FSB leads to dramatic changes when viewing a large number of ground objects (5+ (15 to 20) FPS from 3.0 to 3.6 Ghz), while fiddling with my 6800 GT overclock does absolutely nothing in this scenario. Seems to me that triangle setup is very expensive in LOMAC, or perhaps they are not using vertex buffers optimally.. can't say without seeing the code really. Furthermore, but this is GPU-related, many of the shaders are fairly unoptimised, especially overcast.