September 2007
Intermediate to advanced
170 pages
4h 24m
English
Content preview from High Performance Web Sites
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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.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.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
Chapter 17. Deconstructing 10 Top Sites
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 17-1 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 17-1. 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 |
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 |
Not surprisingly, page weight and response time are strongly correlated, with a correlation coefficient of 0.94, as shown in Figure 17-1. This makes sense—adding more components or larger components to the page makes it slower. Plotting page weight and response time throughout the development process is a worthwhile analysis for any web page undergoing performance improvements.
Figure 17-1. Page weight and response time are correlated
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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.