The same here. Loaded a c172 at FD74.
7 fps …
Take off straight to the south. When passing 1200ft AGL, framerates jumped up to normal.
Then turning north towards the airfield at 2000ft. When approaching the airfield, framerates again took a dive to 7fps.
Intel i9 10900K
Radeon RX6900XT
16Gb RAM
1 Tb PCIe SSD