[ubuntu] Network Switch Question

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http://ubuntuforums.org – I don't know a lot about network switches. I was wondering if one would help speed up a network with three computers, a wii/netflix as the main internet connected devices? Would it be worth it to purchase one? And, yes, I do have slow upload speed to my server and the connection is in and out a lot. Would a switch be helpful? (HowTos)