As you can see from below images the perfomance diffrence is astonishing. It’s odd because it happen only this one map, and not on Example_map.
It happen regardless if I run inside editor, in separate Window (Play On) or debug mode from Visual Studio.
I went ahead and uploaded almost entire thing to FTP:
Lukasz_FantasyTavern_Question.zip
I have skipped few textures from MaterialLayersExample, because they were to big
https://rocket.unrealengine.com/storage/attachments/613-editing.jpg
https://rocket.unrealengine.com/storage/attachments/614-playing.jpg