By watching this fantastic video, you can improve the FPS in MSFS 2020 a lot!

[NeoKingRthur]

There is a tutorial here. This is the one I follow:

Optimal settings for Flight Simulator - Nvidia

Some may not understand how certain settings work, or not realize they are in fact over rendering to resolution and causing a decline in performance with no visual increase. This guide may help you a bit and was based on DAVID FLINCH and his original website info, who explains it well. I had to make corrections to aspects that no longer apply, or will bottleneck new RTX GPU’s First off optimal performance will be in 1080p. FOR 4k Keep some things the same, especially render scaling. Over sca…