Mouse Cursor Flickering and FPS Drops in Editor (FPS Stable Only When Right Click Is Held)

theamazingtr16
Wed, 23 Jul 2025 22:01:33 +0000
Issues and Bug Reporting

Summary

Hello everyone,

I’m experiencing a strange issue in the Unreal Engine Editor. My mouse cursor keeps flickering and there are constant FPS fluctuations when working in the editor. The FPS usually drops from my normal 120 FPS down to 40-70 FPS, and this lasts for 2-3 minutes, not just for a few microseconds.

Additionally, if I switch to another program (like Alt+Tab out of Unreal) and then come back to the editor, the FPS instability and flickering continue. Interestingly, when I hold down the right mouse button and move around in the viewport, the problem seems to temporarily disappear and the FPS becomes stable.

I also recorded a video showing the issue.
(Video attached below.)

Has anyone else experienced this? What could be causing it, and are there any solutions?

My specs:

Unreal Engine version: 5.6

GPU: AMD RX 6750 XT

OS: W11

Thanks in advance!

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Other

Steps to Reproduce

The mouse cursor should move smoothly without any flickering, and the editor’s FPS should remain stable and high (e.g., 120 FPS as usual), regardless of switching between programs or clicking/dragging in the viewport. There should be no FPS drops or instability when navigating the viewport or returning to the editor from another application.

Expected Result

The mouse cursor constantly flickers, and the editor’s FPS fluctuates between 40 and 70 FPS instead of staying at the normal 120 FPS. This instability lasts for a few minutes, especially after switching back to the editor from another program. However, when I hold the right mouse button and move in the viewport, the issue temporarily disappears and the FPS returns to normal. Once I stop holding the right mouse button, the flickering and FPS drops resume.

Observed Result

The mouse cursor constantly flickers and the FPS drops significantly, fluctuating between 40 and 70 FPS (instead of the usual 120 FPS). This issue persists for several minutes, especially after switching back to the editor from anot

Platform(s)

pc,

Video

Unreal Editor flicker problem fps problem

6 posts - 4 participants