FPS drop after Take off

[BlazzerOne]

Hello, since I updated to Windows 10 I have some weird FPS issues. When I load a Aircraft than I get around 35 FPS (in EDDB) after I did a little Testflight around EDDB and landed again at EDDB my FPS were gone. I changed nothing in the Rendering Options.

Both screenshots were taken at the same airport. 

My setup: i7 4770k @ 4.3 Ghz,  Gtx 980, 8gb Ram