I have a network of about 100 users. we use a switch hooked up to 5 each 24 port 10/100 hubs. the network seems uneven in it’s performance. there are no ram or hard drive considerations here. is it possible that there is some conflict (back up) between the 10 and the 100 base systems? we run no peer to peer activity. the server is used for file and print server only.