I'll just let this here.
Changing the timer on a zm map is a bad idea, it'll break your map if played with addons and people may not like to wait more x minutes...
I already did that on my map, but I removed because it was breaking addons for zh + some people didnt like to wait one more minute :s
plus, 3D floors is just a part of the problem on zm10 that's making it lag as you can see here's your map with and without 3D floors
[spoiler]

[/spoiler]
The main problem isn't 3D floors and yes the amount of things being renderedo n a single draw, think on nuts: there's no 3D floors, just a single sector, but there's 1k of monsters making you lag (and on my rainfall script, where you select more objects falling from the sky, more lag you'll have.
So basically what's lagging your map is:
1)3D floors (+- 10fps lost)
2)Objects (+-5 6fps lost)
3)total of sectors being rendered (+-30fps)