One of the less discussed, but highly informative and very thought provoking talk during Velocity 2010 was the one about TCP, latency, window sizes and its relation to web performance. The slides to this talk by â€œJohn Rauserâ€ can be found here . And thanks to Mike Bailey , there is a video recording as well. Follow the slides as you watch the video to understand the talk. TCP and the Lower Bound of Web Performance - John Rauser from Goodfordogs on Vimeo .