Hi, I followed this discussion and did some tests to check the ressource usage:
My server needed ~200MB RAM for 30 connections and not noticably more cpu with the php document server (tested with a small text document). It seems that one user can open more than 20 connections in the same browser window, but then any other users are denied. At least it seemed like that in my test.
But in the php version you can just increase the limit yourself in the php files without recompiling and it seems to work just fine.