Hi ,
Not using driver switching. The integrated graphics is disabled in bios. Previous attempts to test this problem on the integrated graphics failed as UE4 will not launch.
Just tried 4.8 Preview #1. No joy.
I’ve unplugged the 3DConnexion SpaceNavigator and terminated the processes. Terminated Microsoft antivirus / malware, terminated f.lux from https://justgetflux.com and several other non-essentials. I’m still getting a 100 FPS drop on the 3rd person preview (that has been converted to 4.8) when editor tooltips are shown as described in previous posts in this thread.
Screen shot provided here of the remaining processes running on the machine at the time of this last test with 4.8.