I have almost finished my map but i have one problem, my file size is 400 MB mostly because when i edited my side's i just copied the whole folder (i.e cis). So i went through and deleted all my unused odfs mshs etc, but when i munge the file size stay's the same

You should clean.
Also, to save space, delete unit and vehicle reqs you aren't useing and also remove them from the side's req.
Also delete unused textures, they take to most space.

and the msh files...

Also delete unused files in your world folder...but be careful!