That's a very cool way to explain why something happens.
1) What in the world are we talking about? What maps?
2) What is "too many regions"?
3) What is the problem with "too many regions"? What happens?
My best guess is that the map is protected in a way that adds a determined number of regions that take an eternity to load.
This isn't the appropriate forum at all, this belongs at the very least in "world editor help zone".