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.
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.
One script and one stylesheet have an
Expires header that is only nine hours
in the future. According to the
Last-Modified date, 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 future
Expires header to make these files
cacheable. Additionally, there are five IFrames without an
Expires header. These are used
to insert ad images, some of which don't have an
Expires header as well.
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 ...