AT&T Video Optimizer
Multiple Simultaneous Connections to Many Endpoints
Over 80% of Android apps use the mobile network to connect back to servers (https://www.pewinternet.org/2015/11/10/apps-permissions-in-the-google-play-store/) to keep content fresh and recent. Your app likely connects to your "home" servers for content, images and video, but also to ad servers, analytics servers and more.
This best practice calculates the time each network connection opens and closes, and keeps a tally of how many connections are open at any one time. The chart displays the connection that opened to create the "maximum count" of open connections found during the trace. In the example below, that connection opened at 148.747s, and was the 34th connection to be open at the same time.
Best Practice Recommendation
When this best practice fails, look at the connections that were open at the time listed. You may want to use the Waterfall tab, or the list of connections in the overview tab to help you determine what connections were open at that time. If the connections are not in use, close them to ensure that the connections that are in use have enough bandwidth to complete their transactions.