Does anyone with performance issues have Vsync or framerate limiter enabled ?
Try to disbable Vsync and set framerate to unlimited.
Remember to check Your GPU driver Vsync also is turned off.
With modern games and PC systems, Vsync should not be used.
On my system (i7-10700K, RTX2070S, 32GB Ram, SSD) the CRJ is among the smoothest performing aircraft - really.
This is with most settings on High.
Even in VR with my Oculus Quest 2, it really performes smooth.
This is with most settings on Medium.
Yesterday I had e few trips From EKBI-EKCH (EKBI from Vidan Design and EKCH from Fly Tampa).
It ran silky smooth, even when taxiing at EKCH.
BTW - I have alot of mods enabled, like all WorkingTitle mods, DA62X, DA40X, C152X, GNS530 etc.