yes, all of them... The game lags when there's about 100 units (of custom model) in the map.
As far as I know the filesize of the map wouldn't create lag... look at DotA for example. 3.7mb i believe, no lag. Mine, however, 2.4mb severe lag
BTW are you talking about the number of polys? or are you talking about animations
Dota only hav 2 custom modles so that why no lag. U need to reduce the custom modles