How to fix editor stuttering and freezing?

[RecourseDesign]

It could be a problem with Edit Layers, check out this post:

Landscape painting - very laggy

Hi! Running 5.0.2. Whenever I try to paint on my landscape, the FPS dips to under 1. The culprit is Landscape Layer Copy Texture: [UnrealEditor-Win64-DebugGame_7rFQdtVoUW] This is pretty new. It first happened when my shader compression format (Project Settings → Engine/Rendering) was set to Oodle. I changed it to LZ4 and that fixed it. However, since then it regressed somehow and I’m still on LZ4 (though every shader compression format has the same effect). It never happened on UE4. I’ve tr…