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by shoebappa 4790 days ago
But wouldn't 300ms for one request and 300ms for 6 concurrent requests all have the same latency?
1 comments

In the ideal case, sure.

However, according the HTTP archive websites make about ~90 requests per page [1]. The average browser does about 6 requests per hostname, and 15-20 total [2]. In this situation, our critical path has at least 4 requests, thus we are paying 4xRTT in just latency.

edit: formatting

[1] http://httparchive.org/trends.php

[2] http://www.browserscope.org/results?o=xhr&v=top&cate...