With maps not being made as much now for TTT, getting a map of this quality is great. http://steamcommunity.com/sharedfiles/filedetails/?id=761923626&searchtext= Features - Custom animated textures - 32 player spawns - Custom models - Looks like the original (Thanks again to Litronom) - Every weapon may spawn - Moving boats - Just try it out!
Probably the fact that it's such a large map, like @Yatty said. It can be optimized, but that would take some time. If I can find said time, I'll gladly do it.