Substantially Slower Internet - Two MacBook Pros on Network

I have recently acquired a MacBook Pro, running Os/x version 10.5.8, and the internet functionality is noticeably slower than other systems on the network.
Both my desktop PC (running vista) along with my roommate's MacBook Pro surf/download at high speeds, as provided by our ISP (comcast). However, this particular machine can take anywhere from 20-30 seconds to open a basic webpage that would open instantaneously on either of the other two systems. Download speeds are often 10 times slower.
Any solutions to this particular problem? I've done a bit of research on google, and found some aged inquiries that were similar, often with multiple possible "solutions", but usually applying to an older os/x.

No.
Also, why would that slow this machine but no others were that the case? (This question is purely hypothetical. Torrents are not running)

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