I've been taking a break with working on my custom story but yesterday I decided to start adding some details on the map I'm currently working on and then I tried to play it, it gets all laggy and everythings is standing still. The only thing I did was adding some pebbles and some lamps. I couldn't move at all, I even sent the map to a friend to see if it was something wrong with my computer and not even he could move and he has a very good gaming-computer.
Now I have removed the details I added and even somethings I put there mothns ago, before the break. I really don't know what to do and I couldn't find anything on the forum.
Hope you guys could help me, it would suck if I had to start over again.
Thanks in advance!