Why do i lag only on aim maps?

You're not supposed to be here. Moving. Oh, and probably because custom maps are usually unoptimised garbage.

I'm a complete noob when it comes to map making. But I've made some aim maps and everyone who has tried them out has had great fps and no lag. Only reason I can think of for why you are lagging on aim maps, is that the person who made it has made an enormous skybox or something like that.

I think Scud is right.
I made some maps, and there are plenty of reason to get LAG,
one is the skybox, did you chekc is the map isn't too big, or too many bots, or things like that?

is that a reference to half-life 2's soundtrack by any chance? ;D

also yeah, i find most aim maps are really unoptimized, especially with a lot of people. (10+)