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Ensure programs aren't running the the background that use an unpredictable amount of resources (i.e. Kazaa Lite) or SETI@home. And it may just be you have an older vid card that slows down when there are a lot of folks on-screen. If it's getting unwatchable (NTSC Video, or standard TV in the US, is only 30fps) try closing more programs and lowering your HL resolution.
Or update video drivers if you dare.
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