Server hosting and lag

Will having almost a full second copy of garrysmod in garrysmod/BLAHBLAH cause major lag?

So if you had a bunch of maps, textures, addons, data, and stuff that affected sandbox, you could put that in garrysmod/SANDBOX, and the same for garrysmod/FRETTA, and other ones, just for an easy way to switch between different server setups.