My guess is aggressive compilation of content in the project’s folders, even when that content is not in any map (possibly due to some kind of bug). Which can be an issue every time the editor (rightfully) decides all the shaders (in the project) need to be recompiled.
If I understand correctly, this DDC can be reconfigured in UE5 to use ODSC instead, and that resolves this problem for me. Not sure it’s available in UE4 though.
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