HTTP 1.1 allows 2 connections per host name. On the other hand, yahoo performance rules suggest to reduce the number of DNS look ups.
how does one balance this? thanks
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This article (unfortunatly, quite old, as it’s from 2007 ; but it still seems to be reasonable), might help you : Performance Research, Part 4: Maximizing Parallel Downloads in the Carpool Lane ; quoting the last paragraph :
But read the article : there are some other interesting reflexions and resutls of experimentations.