If you’re getting poor performance in the editor I highly recommend taking the time to go through any applications and background services you have on your system that have on-screen displays and try disabling them.
In my case I went from having 100ms+ frame times while using the editor to a flat 8ms by disabling the startup of “Sonic Studio 2”, an application that came with my on-board sound driver.
Applications that are reported to cause this issue are:
- EVGA’s Precision X - https://answers.unrealengine.com/questions/245936/awful-ui-lag-rendering-the-editor-unusable.html
- ASUS’s Sonic Suite 2 - https://answers.unrealengine.com/questions/284321/any-way-to-fix-ui-lag-in-editor.html#answer-288605
- NZXT’s CAM - Editor crashes when using Shift+O - UE4 AnswerHub
If you encounter another application that causes similar issues please post the applications name so I can add them to this list.