September 2007
Intermediate to advanced
170 pages
4h 24m
English
Content preview from High Performance Web Sites
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eBay
Figure 17-10. http://www.ebay.com
The YSlow grade for eBay (http://www.ebay.com) is very close to a B. With a little bit of work it would perform well. The main problems are with Rules 1, 3, 9, and 13.
- Rule 1: Make Fewer HTTP Requests
The eBay page has 10 scripts and 3 stylesheets. A simple fix would be to use the combination technique described in Chapter 3. Four of the scripts are loaded close together at the top of the page, and three are at the bottom of the page. These should be combined into a top script and a footer script, reducing 10 scripts to 5. The three stylesheets are all loaded close together and should also be combined.
- Rule 3: Add an Expires Header
One script and one stylesheet have an
Expiresheader that is only nine hours in the future. According to theLast-Modifieddate, the stylesheet hasn't been modified in 3 days, and the script in 24 days. These are likely assets that change over time, but given the number of users of the site, it would be better to use a far futureExpiresheader to make these files cacheable. Additionally, there are five IFrames without anExpiresheader. These are used to insert ad images, some of which don't have anExpiresheader as well.- Rule 9: Reduce DNS Lookups
Nine different domains are used in the eBay page. Typically, a domain count this high includes several domains from third-party advertisers, but in this case, there are seven ...
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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.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.