|So you are using ICS with one system hosting the internet for the other two?|
What kind of internet service is it? ADSL? Cable? Satellite? Mobile broadband? Dialup?
Most people with more than two PCs choose to use a router to share internet connection rather than ICS. Speed of throughput is only one reason for doing so.
There are other very good reasons including Firewall built into router and that each client system has independent access
Goin' Fishin' (Some day)