I wanted to start a thread specifically speaking about any changes or preferably improvements gamers are noticing in updating to 10.9 Mavericks. So, maybe this thread can be that one spot to come to for info. Like many Mac gamers, I was excited to get the 10.9 update ASAP! I installed it and ran the OpenGL Extensions Viewer, just to make sure it was running the updated version (4.1). I was pleased to learn that it was. Then, just on a lark, I decided to see if Unigine's Heaven benchmark already had the hooks in it to do hardware tessellation (and had been waiting for OSX's graphics subsystem to catch up). Pleasantly, it had (no update needed...just running version 4 of Heaven)! Awesome! The feature looks really good, and makes scenes with certain materials look much more natural and organic. I ran some benchmarks with settings turned on and off to see the differences in performance on my iMac (late 2012 21.5" w/ Nvidia GT 650M GPU). Here are the results (default res for Heaven on my Mac is 1024 x 768) Test one Med qual Tess Norm All Options On AA off ______________ 32 FPS (11 min, 60.8 max) Test two Med qual Tess disabled All Options On AA 4x ______________ 33.7 FPS (11.9 min, 56.2 max) This compares favorably to a benchmark I ran back in February of this year: Med qual Tess not available All Options On AA 4x _____________ 20.3 FPS About a 60% improvement from ML to Mavericks, if my math is right! _____________________________________________ So far, the Valley benchmark doesn't seem to have tessellation in it. Test Med qual Tess unavailable All Options On AA 4x ______________ 39.1 FPS (13.9 min, 61.0 max) Back in March, I got these results in Valley: Unigine Valley (default 1024 x 768) 18.5 FPS (with 4X AA) A 47% improvement in performance (again, if my math is correct) ________________________________________ Rage showed no change from ML (Rage (transcode benchmark) - 70 MT/s) Hopefully, this will serve as a good start for information regarding how well Mavericks is for 3D gaming.