I'm interested to see if anyone else has the same issue happening and know of a fix. I've done a search but couldn't really locate anything useful.
At the beginning of a flight, at any airport with any aircraft I average 30-40FPS (generally an ORBX airport with a quality add-on aircraft Fslabs, PMDG or A2A). In cruise, the FPS gets even better averaging 40 FPS. When I descend and approach an airport, regardless of the time in cruise, FPS drops progressively and ends up at about 10-15 FPS on final even at default airports with default scenery. I also see an occasional struggle where I get a drop down to around 3-5 FPS for a few seconds but this is rarer.
I run the usual add-ons like Active Sky, Envtex and I'm using Tomatoshade. I believe my hardware is up to speed and have my sliders set at mid range levels so it's not asking to much. I have tried the trick with clearing the cache memory every 5 minutes but it doesn't make a difference.
Intel Core i7 8700K 3.7GHz
Gigabyte GeForce RTX2080 WINDFORCE 8GB GDDR6
Corsair 32GB Kit (2x16GB) DDR4
MSI MPG Z390 GAMING PRO
Samsung 970 EVO Plus 1TB
Corsair Hydro Series H75 V2
eVGA SuperNOVA G1+ 750W Power supply
Win 10 64 bit
Any ideas/suggestions appreciated.