Very low fps with RC7

I'am found a problem in RC7 I have 1-2fps, although I don't have a lot of tracks. As an example - this croped map: https://drive.google.com/file/d/1NBcNOTOoC2ZbvFLJ_nf3b3wFZiKfno7K If I delete all the tracks fps is normal With earlier versions of the RoW does not have this problem. While trying to run the RoW v.D5 my world is crashed. What could be the problem?