Multiple windows open drops fps

[Ares9323]

This is a year old bug, I used to have it with 5.0EA and it’s never been solved…

There are other posts about this both on the forum and on reddit but there’s no real solution…

Huge UE5 framerate issue with multiple undocked windows

Chatting with another user on reddit, I discovered this strange bug that was making UE5 not usable for me. I have a 5950x and a 3080ti so it sounded kinda strange to me to see it work so bad, it was laggy even renaming folders and dragging nodes in blueprints… We discovered that the fps number of the editor is exactly the starting number divided by the number of windows not docked to the editor, for example if you start with 60fps and open a window you’ll get 30 fps, then 20, then 15 (and this…

FPS drop when using multiple windows

I recently noticed, I get 30 fps in editor, but 60 when I run the project as standalone. I’m using two monitors. On the 1st I got the editor (game-view, content browser, etc). On the second monitor is a separate window with the blueprints. When both windows are visible, I get 30 fps. When only the 1st one is visible and the second is hidden, I get 60 fps. I guess It’s not a performance problem, I’m at 30% CPU and 50% GPU usage. I also noticed, it caps pretty much exactly at 30 fps, not just some…

An user told me that he solved his issue by disabling TSR (Temporal super resolution), but that was not my case.
I have 6 versions of the engine installed and only one has this issue (source build of branch 4.27-plus), it’s kinda random.

Also try checking the Nvidia control panel (if you have a Nvidia GPU) and in 3D settings check if there’s a max-fps limit (both global and for the unreal editor).