This has probably been mentioned before, but to give you an idea of how bad it is I will tell you that I MAX EVERYTHING (Insane on sliders, vsync, HDR, 32 bit, etc.) in this game and hold it at 32 fps on a 1280 x 1024 res without a single slowdown until I play Starship. When I get to Starship the game drops the fps like a bad habit (5-10 fps, 15 if I'm lucky) and I can't even use the Ultimate preset unless I switch to 16 bit on a 1024 x 768 res. Just thought somebody should make a bug report on this in case somebody wants to have a look at it.
System
-----------
OS: Ubuntu 9.04 64 bit, was using 8.04 64 bit about a week ago
CPU: AMD Phenom II X4 3.0GHz Black Edition, AM2 socket
VGA: Sparkle Nvidia Geforce 9800GTX, 1GB, 256 bit set mostly to performance settings
RAM: 4GB 1066MHz DDR2 in dual channel