「HTTPの同時接続数はどうあるべきか? (slashdot.jp)」というお話。誰も原文を引用していないのが悲しかったので、引いておきます。 8.1.4 Practical Considerations (~中略~) 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. A proxy SHOULD use up to 2*N connections to another server or proxy,