I'm having what appears to be the exact same issue with my external monitor connected to powerful Lenovo laptop through LINDY USB 3 - displayport, since the recent windows update.
Games are virtually unplayable due to massive fps drops and even the simplest windows animations and video appear staggering too, slowing down regular work..
I've spent most of the weekend googling and trying to solve the issue driverwise, including but not limited to what you mention, with no luck at all. So now i will resolve to try and backdate my windows build to the previous version..
I am very curious to hear of other possible solutions to this issue, or an updated driver that does things better than this.
Cheers,
Adrian
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