Link: http://trac.tools.ietf.org/wg/httpbis/trac/ticket/131
Component: p1-messaging
Part 1, section 7.1.4 recommends:
"Clients that use persistent connections SHOULD limit the number of simultaneous connections that they maintain to a given server. A single-user client SHOULD NOT maintain more than 2 connections with any server or proxy."
UAs increasingly allow more connections to take advantage of high bandwidths, we probably should consider increasing the recommended limit.