What is it?
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HLDS Ping Booster is a small tweak to the Half-Life Dedicated Server that drastically reduces player pings and generally makes the game much more responsive.

Technical explanation:
There is a small flaw in the way frame timing is implemented in HLDS. Basically your average HL server is just sitting idle about 15ms between every frame. This little tweak fixes that.



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http://www.udpsoft.com/booster/