Hi, same problem here, i have:
 
	I5 9600K
 
	32gb ram
 
	Rtx 2060 Super 8Gb
 
	Tested in LIML (payware airport) 15-25 fps A310, B737 Pmdg 40\50 Fps, Fenix A320 30\40
 
	With A310 Cpu and Gpu seems are sleeping, 35\40% cpu use and 20\25 Fps Gpu with low gpu clock, 1200\1500 mhz and not 1900 max
 
	1080P change from low to ultra hight setting, change 2\3 fps only, i try both dx11 and 12 and dlss yes and not.
 
	I hope can help you to investigate.