When the Nvidia In-game overlay is enabled it appears to cause performance issues with the editor. If the editor is open before the overlay is enabled it does not seem to cause any issues.
I stumbled across this when helping some users with FPS issues in their projects.

Steps to Reproduce
  1. Ensure that the In-Game overlay is enabled
  2. Open any project (could be a blank new project)
  3. Hover over anything in the editor to bring up a tooltip
  4. FPS will drop significantly

This is just a very basic way to showcase this, FPS drops are persistent in just about every aspect of the engine when this overlay is enabled.

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Won't Fix
ComponentUE - Rendering
Affects Versions4.
CreatedDec 14, 2017
ResolvedDec 18, 2017
UpdatedApr 27, 2018