Optimization of parallel downloads to minimize costs

Original author: website optimization
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Note: Below is a translation of the article “Optimize Parallel Downloads to Minimize Object Overhead” , in which authors consider parallel loading of objects, and how it affects the performance of a web page. My comments are further in italics.

An average web page contains more than 50 sites (Krishnamurthy and Wills 2006), while the cost of the number of sites dominates all other delays in loading most web pages (Yuan 2005). Browsers, following the recommendations of the specification HTTP 1.1, usually establish no more than 2 simultaneous connections ( this is true only for IE6 / 7, for Firefox and Opera this parameter is customizable, at least 4, by default. For IE8, according to Alex Mogilevsky, most likely 6) with one host. With an increase in the number of HTTP requests required to display the page from 3 to 23, the time spent precisely on “clean” loading of objects from the total loading time drops from 50% to only 14% (see Figure 1).

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