some routers do this, also if you use windwos XP or 2000 right click the name of the process in the task manager and give it higher priority, but DO NOT hit real-time unless you dont feel you need to move the mouse or see a refreshed screen again (real time takes all processes away and takes to itself, including basic system operations)
other ways would to have the router closest to that computer (shorter wire, shorter distance, slightly faster response time)
Other than that, it really relies on the TCP/IP OSI model which makes HTTP traffic a lower priority than say echo traffic if i remember correctly, but this should help increase aka prioritize the bandwidth.
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