Deviant PC has posted a Internet Connection Guide
As windows sets the MaxMTU to 1500 bytes in the first place, almost any personalization will be of benefit. Taking the examples earlier in this guides, Windows claims by default it can handle 1500 bytes in one packet. For a connection that can only handle 800 means data is packaged into 1500 byte units and then has to be fragmented by the modem, which takes time and slows your connection down.Read more