Will update here about the mods i’m using that decreases performance and what you need to do to tune it to use that mod 
Bijan season is fine 
No dramatic change in performance.
Asobo ESSA Arlanda airport makes my GPU stall at high gpu usage suddenly. This needs to be fixed by Asobo. This exact same issue happens over New York sometimes. Quick fix helps sometimes ALT+TAB into another window then ALT+TAB Into the sim again. OR ALT+ENTER to make it go into windowed mode. Pressing esc-key makes it happen more often.
I think it would be good to have some category in bugs&issues of 3rd party compatibility issues. Or it could be located in 3rd party category. That would help us identify problems caused by those and it will help 3rd party devs find problems caused by those 3rd party addons.