Roller Coaster Tycoon question

In RC3 Complete if you were, say, building an insane park, 255x255 with every square crammed with something, is there a FPS, loading time, or some other advantage to having only one type of tree, path queue, food stall, etc? My FPS is already stupid low and I'm not done yet. My record is about 7200 attendees (in a park that kinda ran into litter/vomit problems) and I'm 1600 short of that.
 
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