just solved the problem by creating a static mesh out of the whole group.
I think the main problem was a reference to the other meshes by copy/pasting them into the level. now everything is fine and fast, thx for help
just solved the problem by creating a static mesh out of the whole group.
I think the main problem was a reference to the other meshes by copy/pasting them into the level. now everything is fine and fast, thx for help