I've uninstalled Skymaxx Details...... Before Skymaxx, I ran X-plane on very high settings with default clouds:- Texture Res - Extreme Res - Highest res on iMac 27" HDR - Off Pixel lights - On Gritty Textures - On Buildings - Tons Trees - Sparse AA - off Anisotropic - 8x World Detail - High Airport Detail - Extreme Cloud Puffs - 100% iMac 27" (Late 2013) 3.5ghz i7 8Gb Ram 1Tb Fusion Drive GTX780MX 4Gb video card X-Plane 10 Global With the settings and system above, I can run X-Plane at 25+ FPS without fail. No stutters, weather updates are smooth, nice transition between cloud layers and distant clouds. When I install Skymaxx, the FPS is wild, it goes from 2FPS upto 19 FPS, Stutters and practically stops the sim on updates. I have everything on the Skymaxx set to the lowest possible setting i.e off or far to the left sliders or number 1 option. On the website, it clearly says there is an improvement in frame rates above default setting, I've not seen this anywhere in my experience and if that means lowering my sim settings then yes you will get better frame rates much like the default would. I have to say, Skymaxx Pro is broke, looking foward to an urgent update. Seems harsh I know but I'm sick of developers selling products that don't work as advertised and expect customers to use there hard earned money to fund the beta testing and future development. Why state it increases frame rates when it doesn't, quite the opposite and it's not just me either having searched the forums is various places. I've read there is a memory leak in the program, it may explain the problems people are having, these are fundamental problems that should be eliminated before it is sold, it's old school that ensuring memory leaks are plugged. I wouldn't buy a car with a leaking fuel tank, that's what I've done here. It's not on, customers expect better than this. I want to give the developers a chance to rectify this, fix the memory leak, improve the FPS and transition updates and work towards a better product, it after all is very good at representing the sky, some spectacular views but I'm very disappointed with my purchase so far. You have got to get an update out ASAP. Cheers Lee