MSFS is like the weather... sometimes this way sometimes that way

[Chemic3l]

I have the feeling and maybe someone can explain me the “problem” that sometimes I think as the title says that MSFS is like the weather. I fly with the 747 from OMDB to YMML ( 13H overnight ) with consistently 60-70 FPS. Now I fly from OMDB to EGLL and after 2H with the 747 I am back to 20 FPS. Although I left all settings as I had them before. I cached the flight to EGLL and again I am at 60-70 FPS.
What’s going on ? why is it sometimes like this ?

[hobanagerik]

Have you had a look at this thread?

After playing a few hours, FPS drops from 40 to 5FPS

Exactly the same for me, after playing a few hours, FPS drops from 40 to 5FPS or even lower. Playing on high. Ryzen 7 3800x 32GB RAM RTX 2080 Super 8GB VRAM 1 TB Nvme gen 3 600 Mbs wired ethernet connection No AI aircraft, just opened a ticket to Microsoft