Horrible performances anywhere except when I load a flight from KSBA

Like the tittle indicates, if I load a flight from free flight anywhere in the world I get 20FPS either in 2D or VR it doesn’t matter. But if I load my flight into KSBA the performance of the sim are as expected either in VR (45 FPS) or 2D with high FPS.
Why KSBA you might ask, this is one of the airport I fly the most out of or do my test flights.
I’ve tried everything I could think of with the ROLLING CACHE
Thanks for any suggestion or should I report this as a bug?

Agreed, it’s not consistent however. Some airfields will be fine, some won’t. But we just tested the same places at the same time and we both got the same results every time.

It’s actually not everywhere, but most of the west coast above KSBA is unflyable, try KRDD and KBVS you’ll see it’s terrible.