While UE4 Editor used to work fine for a couple of years, I now notice weird framerate issues.
The editor window runs at 37 FPS when focused.
- It drops to 25 FPS if my mouse hover a button.
- It raises to 45 FPS if Unreal is not focused at all (click on desktop).
- It maxes out at 60 FPS (the value set in project settings) if any window of Unreal is focused,
except for the editor. - Playing the game is inconsistent: sometimes it runs around 40-ish FPS, sometimes around 20 (while it used to run smooth at 90+ FPS).
That’s what puzzles me. If I uncap the FPS, the editor is capable of running at 180 FPS when I focus the content browser window, so it’s not a hardware issue. As soon as I click on the level editor, it drops dramatically.
On this screenshot, you can see how it drops to 25 FPS when hovering a button, even though no level has been loaded. (yes, it’s 25 FPS for a black screen).
Any idea? Maybe some settings went wrong?