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Chapter 1. The Importance of Frontend Performance > The Performance Golden Rule
1.3. The Performance Golden Rule
This phenomenon of spending only 10–20% of the response time downloading the HTML document is not isolated to Yahoo!'s home page. This statistic holds true for all of the Yahoo! properties I've analyzed (except for Yahoo! Search because of the small number of components in the page). Furthermore, this statistic is true across most web sites. Table 1-1 shows 10 top U.S. web sites extracted from http://www.alexa.com. Note that all of these except AOL were in the top 10 U.S. web sites. Craigslist.org was in the top 10, but its pages have little to no images, scripts, and stylesheets, and thus was a poor example to use. So, I chose to include AOL in its place.
| Empty cache | Primed cache | |
|---|---|---|
| AOL | 6% | 14% |
| Amazon | 18% | 14% |
| CNN | 19% | 8% |
| eBay | 2% | 8% |
| 14% | 36% | |
| MSN | 3% | 5% |
| MySpace | 4% | 14% |
| Wikipedia | 20% | 12% |
| Yahoo! | 5% | 12% |
| YouTube | 3% | 5% |
