Unreal Engine 4 hangs during building lightning

The Editor is hanging, if I build lightning, but the computer use only 30% ram, 70% gpu, 25% of the disk.

Hi Johann Muhl,

When building lighting you should see the Swarm Agent icon in your task bar (Pictured below.) Double-click this to open and set your cache folder, maximum jobs to keep, and cache size. Also check out this AnswerHub post about SWARM: [Swarm - What is it and how to use it?][1]

Let me know if this does not resolve your issue.

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