September 2007
Intermediate to advanced
170 pages
4h 24m
English
Content preview from High Performance Web Sites
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YouTube
Figure 17-25. http://www.youtube.com
YouTube's home page (http://www.youtube.com) isn't very heavy, but it has a low YSlow grade and ends up in the bottom half of response times. Figure 17-26 shows that there isn't very much parallelization at the beginning and end. Increasing the level of parallelization in these areas would make the greatest improvement to response times.
Figure 17-26. YouTube HTTP requests
In the beginning of the page load, the main hurdle to parallelization is the six scripts downloaded back-to-back. As explained in Chapter 8, scripts block all other downloads, no matter what their hostnames are. Additionally, the scripts aren't minified. Combining these six scripts into a single script and minifying them would decrease the download time. Also, if any of these scripts could be downloaded later in the page, the initial part of the page would be downloaded and rendered sooner.
At the end of the page, decreased parallelization results from downloading 15 images from a single hostname (img.youtube.com). YouTube only uses four unique hostnames in their page. It would be worth the cost of an extra DNS lookup to split these 15 downloads across two hostnames and double the amount of simultaneous downloads.
Sadly, not a single component has a far future Expires header ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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