Just thought I’d flag the following video - try disabling fullscreen optimisation in the flightsimulator.exe
This has both fixed the issues I had after the latest update, and boosted FPS compared to before the problem began. Worth a try I reckon, until Asobo issues a fix?
Sorry @StarCheese35023, this is not helping at all.
Tried at 76T airport that is systematically causing massive stuttering to many of us - stutters still there, no performance gain at all. Have you some proof (before / after video capture, or screenshots) that this is the solution for the issue.
Until then, I recommend others not wasting time trying this - this is not helping at all.
Seems to me OP wants just to gain some attention and views of his YT channel IMHO…
You are exactly right
That’s just snake oil.
Forget it.
(You gonna’ let every lousy YouTuber make you do stuff under the hood of your Flight Sim Rig?)
This particular setting does absolutely nothing for MSFS 2020 and Stevex77 hits the nail on the head with why they put this bollox on their YT channels;
They’re not trying to help, they’re trying to get Hits.
Yes, they are just parasites… Btw. Tried this just because I needed arguments to identify this “bloodsucker” and avoid others to click on his YT ****. 
Because I’m an IT pro, I was sure that this can’t broke anyting on my system.
I’ve tried this fix yesterday and today my sim won’t launch no matter what. Weird coincidence…
This seems to reduce the intermediate stutters during the game introduced by WU3 and last Sim Update… so i dont think he is a Like/Hits scammer…
But for sure it does not resolve the problem with the mainthread CPU Problem causing the GPU to be utilizued fpr 40-50% in some cases especially on Airports inside Airliner Cockpits…
didn’t work for me.