MSFS 2020 FPS ISSUES

I'm having major issues with MSFS 2020 at the moment.

My current specs are:

• Intel i7-8700K
• 32 GB RAM
• RTX 2070 Super
• 1440p (2K) monitor

I'm running the lowest graphics settings with DX11, NVIDIA DLSS enabled, and Rolling Cache disabled.

The only add-ons I have installed are MSFS AutoFPS, SimBridge, and SimLink.

I've also tested with no background applications running.

When I start a flight, I get around 60 FPS at smaller, quieter airports. However, as soon as I take off, I can noticeably feel the FPS dropping. After around 20 minutes of flight time, it consistently drops to about 3 FPS.

The last time I played MSFS (around six months ago), I was using 16 GB of RAM and a GTX 1080, and I didn't have any of these issues. I consistently got 30+ FPS, even at larger airports.

I don't have similar issues in any other games.

Has anyone experienced something similar or knows of a fix?

Thanks!