You have semt me diagnose for tweaking. Your suggest:'external' frame rate limiter. There is download link you give. When I click, file comes up, I save. Problem:What do I open this with? You write windows RAR. This take me to whole other direction. Reading hwo to run this tool.There must be simpler way just to run Frame rate limiter without have to signup for this signup for that. Consider removing your FIBER_FRAME_TIME_FRACTION *IF* you experience micro-stutters: I look in Fsx cfg. Cannot find this. Can you tell me where is? Thank you much.

Open the .rar file. Extract the files to a temp directory. Run the .jar file. It will ask where the fsx.exe file is located. Select it, then it will create a .bat file. Start FSX using the .bat file. F11 and F12 to decrease and increase FPS, respectively.FSX.cfg is in (for Vista)C:\Users\Your Username\AppData\Roaming\Microsoft\FSX