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103 Chapter 15 CHAPTER 15 Deconstructing 10 Top Sites15 What follows is an examination of 10 top U.S. web sites using the rules and tools described in this book. This analysis gives examples of how to identify performance improvements in real-world web sites. My hope is that after walking through these examples you will look at web sites with the critical eye of a performance advocate. Page Weight, Response Time, YSlow Grade Table 15-1 shows the page weight, response time, and YSlow grade for the home pages of 10 top U.S. web sites as measured in early 2007. YSlow is a performance tool developed at Yahoo! that produces a single score (A is best, F is worst) for how well a page satisfies the performance rules described in this book. See the upcoming section "How the Tests Were Done" for more information. Table 15-1. Performance summary of 10 top U.S. web sites Page weight Response time YSlow grade Amazon 405K 15.9 sec D AOL 182K 11.5 sec F CNN 502K 22.4 sec F eBay 275K 9.6 sec C Google 18K 1.7 sec A MSN 221K 9.3 sec F MySpace 205K 7.8 sec D Wikipedia 106K 6.2 sec C Yahoo! 178K 5.9 sec A YouTube 139K 9.6 sec D