Opening another level takes very long

Hello there,

I am just working on a level in the editor and wanted to change to another level. Now I am stuck with the loading bar “Loading map: Login_00.umap… (Clearing existing world) 0%” for 10 minutes now.

Visual Studio says “Process Memory: 11 GB”… that is high, right? I just yesterday edited my landscape and added thousands of rocks with the foliage tool. Could that be the problem? Has anyone encountered this problem or has any suggestions how to solve it?

Thanks in advance!