If EmoBoys is just your friend that gave you the idea for the map, then why is his name listed as the creator?
And I don't think it was a single trigger that made the map laggy (unless it almost froze the game up until you removed a certain trigger), but almost every trigger has location leaks among others. There are way too many units randomly thrown in the game also contributing to some lag and confusion issues.
None of the areas look like they should, especially the lab. It looks like a walled outdoor park area to me.
Why do "ghouls" move so fast if they're crawling on the ground? They move faster than normal zombies do. There's no survival tactics either. It's just kill or be killed.
There's just too many problems with this map. I rate it 1/5 due to the fact that there's no real strategy, detail or structure to make this game entertaining or even worth playing.