The lag issue, I don't know if its just me, but in spec, there is an exact replica of the town and you can see everyone moving around, it is like a projection, and that is where the lag comes from.

This map either needs removal or fixing. The fixes are really simple too, just remove props. A lot of those stupid small rooms have 2 vending machines in them, so once you knock them over, there is no longer any room to push them. And the hallways are too tight to pull them out even if they did fit through the doorways. So instead of 2 props, fix each room to have only 1, and that includes that long narrow room with 2 entrances. 2 people could sit in there with one side caded easily. A few ladders around the map would be nice too, to get up onto the tops of the buildings.