I don't understand this. I boot up my PC today, and suddenly out of nowhere my FPS is a bit lower. I have a test flight scenario to test FPS with the Fraps FPS counter displayed. Usually I am at 41 FPS there but now I'm only at 36. That's a 15% loss. I have not changed any settings in FSX. I tried a new fsx.CFG, disabling virus scanner... I even tried disabling UTX alltogether which gained me 1 FPS but then it's still lower than my previous 41. Currently, I don't know it anymore. The only thing I can remember that has happened were windows updates yesterday, but should that really be causing a 15% FPS loss out of nowhere?

Checked my BIOS settings, still at 4.6 GHz and I'm stable. No GPU overclock either. Tried disabling AA, tried uninstalling add-on manager because that messes with my fsx.CFG, restored my saved fsx.CFG which previously gave me 42 FPS there, but no avail. I can't get above 37 FPS not even with UTX disabled.

I am absolutely puzzled this time. Might as well give up on my simming hobby. I'm not going to reinstall FSX this time.

Never mind, I think I found the culprit.

Turns out the framerate limit of the displays inside the NGX influences overall framerate as well. I always had it at 30 giving me 41 FPS in this scenario and lately changed it to 60 which dropped my FPS back a bit. Changed it back to 30 and voila, got my 41 FPS back.