Hello out there, When I upgraded from OS X 10.3.9 to 10.5.2, the frame rate of my OpenGL app dropped in half. This is an FB question but may also apply to FBtoC. I don't have 10.4 access on the same machine. When I compile the SimpleBlocks Demo and just launch it, I get 140+ fps under 10.5.2 but 200+ fps under 10.3.9. (I bypassed the 60 Hz limiter). I am using the same setup of Millions of Colors and 1280 x 800. I applied the 10.5.2 'Graphics Update' but no improvement. Any ideas for performance improvements under 10.5? Thanks, John G iMac G5 1.8 GHz, 512 MB Ram, 64 MB VRAM GeForce FX 5200, OS X 10.3.9 & 10.5.2