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 - Awful UI lag rendering the editor unusable - Programming & Scripting - Unreal Engine Forums
- ASUS’s Sonic Suite 2 - Any way to fix UI lag in Editor? - Mobile - Unreal Engine Forums
- NZXT’s CAM - Editor crashes when using Shift+O - Platform & Builds - Unreal Engine Forums
If you encounter another application that causes similar issues please post the applications name so I can add them to this list.