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Question: Best configuration for Linksys SLM2048

Wich is the best configuration for Linksys SLM2048 if I just want to use it as a common switch (non managed).
I'm having problems of lag in the online games of my network when move/copy files from a PC to other. Tried a 10/100 switch and everything goes ok.
Before sending it at RMA, I just want to be sure that is not a problem of configuration.
Thanks in advice!.