Massive FPS drop because of SU9

Are you using Developer Mode or made changes in it?

No

Brief description of the issue:

I am experiencing severe lag and stuttering. Even just starting a new flight and leave it at the runway, it will eventually lag (go down to ZERO fps) for 5-10 seconds before stuttering for a few seconds, and become fine again. And within 1-2 minutes all this repeats itself.

It does not matter at which airport am or what plane I fly. The behavior is the same.

The CPU and GPU load is well below 50%.
RAM usage is at 21GB.

PC specs and/or peripheral set up if relevant:

Ryzen 9 5960x, 64GB RAM, RTX 3090

Build Version # when you first started experiencing this issue:

1.25.7.0


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