Massive FPS loss when window is focused

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Are you using Developer Mode or made changes in it?

No

Brief description of the issue:

MSFS has a massive FPS drop and freeze as soon as the window is focused in both Windowed mode and full screen, making the game completely unplayable on my system.

Provide Screenshot(s)/video(s) of the issue encountered:

Detailed steps to reproduce the issue encountered:

Starting the game and clicking on the program to focus it

PC specs and/or peripheral set up if relevant:

RTX 3080; i9-10850K; Thrustmaster Warthog and HOTAS with T.Pendicular rudder

Build Version # when you first started experiencing this issue:

SD9


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Do you have the same issue if you follow the OP’s steps to reproduce it?

Provide extra information to complete the original description of the issue:

If relevant, provide additional screenshots/video:

I get this as well now

Turn off Hardware Accelerated GPU Scheduling, helped in my case (4090, 5800x3d)! Windows Logo - search for graphics settings - then turn it off (both in 10 and 11 this feature is there)

If you dont mind let me know if it helped