Abstract: A congestion control mechanism is described that is specifically designed to enhance the operation of TCP communication sessions for the delivery of web content. The congestion control mechanism dynamically adjusts the size of the congestion window in a manner that maximizes the speed of content delivery for web page requests in a cellular network. The dynamic window size adjustments, including the initial congestion control window size, are adaptive, changing as cellular network conditions change, and in a manner that is not possible with conventional TCP congestion control mechanisms that were not explicitly designed to accelerate content in cellular networks. The congestion control mechanism also learns from previous experience with a particular end user device address and network, and applies its learning to set its initial values and subsequent behavior to more optimal levels for the particular end user device and network.