According to Google's Urs Holzle (during his keynote presentation at the Velocity 2010 conference yesterday): ".. Google has seen a 12% improvement in the performance of its sites through refinements in its implementation of TCP/IP."
See a paper from Google "An Argument for Increasing TCP’s Initial Congestion Window" - here. The paper concludes: "Increasing TCP’s initial congestion window is a small change with a significant positive impact on Web transfer latency"
Google work is not limited to TCP - DNS and HTTP improvements ("SPDY") also contribute to a faster web service.
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