Here’s a few things that have worked for me so I can have fluid FPS in most scenarios…
-Move PG cities into a backup folder and only keep the region I’m flying active.
-Keep Terrain LOD at 105-125, anything over 150 my FPS start decreasing and stutters increase.
-I disable all tabs in the toolbar and only enable the tab when I need it. The VFR map tab seems to cause FPS drops and stutters.
-I use intelligent standby list cleaner which helps with stutters.
-I only keep folders in the community folder which I am actively using. The rest are moved to a backup folder.