davido53, I suspect this is a controller issue not with P3D v2.5. I did the full install and to my surprise this seems to be the very best version of Prepar3D yet. It is so smooth I get about 2 FPS variation with the setting at 33. Rarely below 31 but mostly 33. I have always had a single stutter about every 30 seconds. This is gone. Now waiting for ORBX to bring out the compatibility software for Global, Vector, Pilot, the large area software and local airfields. Don't install any of these until the updates come out. I tried it but had to reinstall P3D v2.5. My own produced photo real scenery works very well. LM has a winner here.