Hello, been using FSX for a few years now and keep having the odd problem with it, but usually managing to fix it. This time, i'm having to post a question of my own because I can't find a solution elsewhere. As far as I know, this hapens with any aircraft, in any location. What happens is that whilst running the sim, whether taxiing or flying or whatever, it keeps freezing completely for a few seconds at a time, then it all continues again. The only thing I can think of to compare it to is like a video stopping to buffer. (I'm not saying that's the cause, it's just a comparison). Any ideas? PC specs: Windows 7 64bit Intel i7-3930k CPU 16.0GB RAM Nvidia GeForce GTX 650Ti GPU Running FSX with Acceleration In case it makes a difference; i use REX essential plus with overdrive, and UK2000 Heathrow scenery, but i've used these for a while with no problems, so I don't think it's that. Also, if i open a second view window (picture in picture style), I get some very odd wall-like textures glitching about on the second view window, which is another issue I'm having. Thanks EDIT: After a bit of playing around with settings, i've fixed the issue now. In case anyone else gets this issue, mine was fixable by removing the framerate limit on Nvidia inspector.