Just to throw my experience into the mix with my iMac i5 3.3Ghz with R9 M395 Graphics running on both OS (MacOS and Windows 10).So using the same config (1080p, medium setting, VSync on) and the difference in FPS is very wide.MacOS: Around 30 - 40 fps (with some tweaking, like lowering shadows boots this to 60 FPS)Windows: Around 60 - 70 fpsRegardless, the improvements of the 64Bit client for MacOS are very noticeable and very welcomed! :heart: