How to solve the local area network within the plug?

A total of 3 of our local area network computer, a computer connected to the Internet and the other two computers connected to it.3 when the computer in any 2 computer access at the same time, there will be serious to plug the network, network speed Become very slow and only if one of the computer Internet, the speed will be faster.This brings me to the Internet is not convenient, regular access to stagger the time.How to solve this problem?

This is also called local area network ah!
estimate your cable, you also export ah how much bandwidth to buy a router, to solve all the problems are.
phenomenon is caused by your current host because you load too heavy, 3 of Networks have to convert it to complete, so you buy a route to liberate it you should call on the sharing of Internet cafes, is strongly recommended that you get a router, even if more was not even two more slowly, as long as the non-use Thunder and the like as a tool.