John Heidemann

Analysis of HTTP Performance

TitleAnalysis of HTTP Performance
Publication TypeTechnical Report
Year of Publication1998
AuthorsJ. Touch, J. Heidemann, and K. Obraczka
Date Publishedaug

We discuss the performance effects of using per-transaction TCP connections for HTTP access, and the proposed optimizations of avoiding per-transaction re-connection and TCP slow-start restart overheads. We analyze the performance penalties of the interaction of HTTP and TCP. Our observations indicate that the proposed optimizations do not substantially affect Web access for the vast majority of users, who typically see end-to-end latencies of 100-250 ms and use low bandwidth lines. Under these conditions, there are only 1-2 packets in transit between the client and server, and the optimizations reduce the overall transaction time by only 11%. Rates over 200 Kbps are required in order to achieve at least a 50% reduction in transaction time, resulting in a user-noticeable performance enhancement.