Map Size Questions

[Rapture]

I'm working on a new project. Then I noticed that the filesize for my first map was already 10MB. Biggest filesize for a map so far I've seen.

My map is fairly large, very detailed with entities and stuff. But I feel like its gotten so big really fast.

So my questions are...

1) Should I cut down on the number of stuff in my map so the map is smaller in file size. I am not putting my entire story in one map, its just very detailed and large I suppose.

2) Am I doing something wrong somehow? I only have about 10 billboards, 30 light sources, 30 particle systems (water mist + light dust) and just a crap load of entities, static objects, etc...