UE5.4.0 usage extremely laggy

General Issues and Bug Reporting
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I’m on 5.4.4 and have the same problem (No problems with 5.3.2), so unfortunately the bug is still present

Here’s a video which clearly shows the problem: https://youtu.be/U1YjET5txwM

Like @Rawalanche, neither disabling the Studio Telemetry Plugin nor setting r.rhithread.enable 0 fixes the issue for me. r.RHISetGPUCaptureOptions 1 also doesn’t help. Keeping a window like “Project settings” open also didn’t help.

@comlys Suggestion of launching the editor with DerivedDataCacheCommandlet (ie: -run=DerivedDataCache) also made no difference

The only thing that fixes it (for a while, at least) is messing with the “Global Illumination” setting. - See my video for a demonstration.

There’s similar threads on this as well:

[SOLVED!] Stuttering on an empty project on both Mac and Windows - Development / Getting Started & Setup - Epic Developer Community Forums (unrealengine.com)

Anyone Got lag every second on Unreal 5.4 - General / Feedback & Requests - Epic Developer Community Forums (unrealengine.com)

Hopefully we get a proper fix for this soon as it appears we’re dealing with a definite regress here