15 FPS in editor since update to V 4.25.4

Just wanted to report a bug with the current HotFix to version 4.25.4
Version 4.25.3 was runing just fine, however after updating to version 4.25.4, im getting supper slow
12 to 15 FPS on a empty scene in the Editor.

I have a two Monitor setup, when “working” with the second monitor, importing assets, textures etc… the editor
FPS are just fine but as soon i move my mouse back into the viewport on the first monitor, the FPS drops again to 15 FPS.

Just figured something out…
Starting the Editor from the installation folder with the UE4Editor.exe, seems to work just fine. It seems that the issue appears only when starting the Editor from the launcher.

Things i have tried so far…

  1. Deleted and redownlaoded UE4 from scratch.
  2. Updated my Nvidia drivers to the newest version
  3. Geforce Experience overlay is turned off


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