Can I just say. Apparently Feral City has SO MANY items, meshes etc etc that it does become partly unstable to run on some computers because of the file size.
If you perhaps try to get in the map, let it load before you move. Look up to reduce the lag.
This may not always guarantee you'll get right in the map. But waiting and letting the stuff load first may help you slightly.
Like I said, Feral City is FULL of items and is very laggy.