Hi Umberto,
Thank you for your reply.
I have tried the same things as you, tried with the nVidia GeForce experience overlay enabled or disabled, no difference, no fps loss when undocking in either way (without GSX).
The only time I have a big FPS loss is when I make the FSDT live update.
Starting P3D V4.5 with GSX enabled everything works fine, great FPS, GSX as normal, jetways, passengers, bagage and so on, no problems.
I can undock and move several windows on the main display (3 monitors on a Nvidia GeForce GTX 980 graphic card), still everything is great.
As soon as I move any of the the undocked windows to the fourth monitor (running alone on a Nvidia GeForce GTX 970 graphic card), I get the sharp drop in FPS fom around 60 to 2-3 FPS.
As soon as I move the undocked windows back onto the main display everything runs again super.
When I go back to the old restore point from Tuesday morning 09.06.20., (without GSX), everything is ok again, I can move undocked windows to the fourth display, no FPS loss whatsoever.
The only setback is that I have no GSX available to use it with jetways, passengers, bagage and so on.
I am at a loss, don't know what else to do.
As I described in my first post everything was working great since I bought the Prepar3D v4 Professional License in December 2018 until Wednesday morning 10.06.20. when I ran FSDT live update.
I did no Windows or programm updates of any sort between Tuesday and Wednesday, and only with GSX activated I have the problem.
I am not blaming you and your programm, just looking for help on how to solve this.
Best regards.
Andy