In his book “High Performance Websites” Steve Souders wrote (2007) that browsers limit parallel requests to a domain/hostname to two at a time. Is this still valid today?
In his book High Performance Websites Steve Souders wrote (2007) that browsers limit parallel
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Almost incorrect today.
Most browsers have upgraded to 6 parallel connections. See Steve Souder’s Browserscope > Network tab > Connections per Hostname. Older browsers still restrict to 2 connections – that may or may not be relevant to you depending on the browsers your application supports.