Hey I've just made this map for deathmatch. It's not done completely. But I think it's pretty good for a beginner at map design. Take a look at it.

91K, hella small file size. Kudos to that!

Not bad for a first map, textures seem to hurt my video card though (geforce4 64MB)

I fixed the textures a bit. I just want to know what part of the map is lagging. If you told me that I could change it so it doesn't do it anymore. Mine doesn't seem to hurt my graphics card, but like I said I'd already fixed the textures. But if the arena textures in the dome were the textures that gave u lag I could fix that too.