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UE4 slows down when interacting with BP and level editor.

Basically when I turn on the editor it works fine, I can access things in the UI and edit everything from the detail panel, world outliner etc. but as soon as I try to move the camera, drag and drop a texture or scroll around a blueprint actions get further and further behind. The lag keeps increasing until I alt+tab then bring it back up again at which point everything goes back to normal.

Any help or solution is appreciated.

Product Version: UE 4.7
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asked Sep 05 '15 at 01:45 PM in Using UE4

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avatar image Logan Bailey ♦♦ STAFF Sep 05 '15 at 04:04 PM

Hello mandraxhair,

From what you describe you open a new project, but when you do simple tasks like moving the camera then UE4 starts to lag. This lag then steadily increases until you alt + tab and bring UE4 back to your screen.

I have a few questions for you.

  1. Can you reproduce this in another project?

  2. Can you reproduce this with a more recent version of UE4? Either 4.8 or 4.9?

  3. Please link your DxDiag so that I can see what your computers specs are.

After troubleshooting this and linking this information I can get a better understanding of why this is happening.

Thank you,


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Hello Logan,

I think I figured it out. I went through every process on my computer one by one until the lag stopped. It turns out there was an old driver running for some hardware I don't have any more and after I ended the process the lag stopped immediately. I'm not sure why it was happening but that was definitely what was causing it.

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answered Sep 06 '15 at 05:58 AM

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