High Performance Web Sites: Essential Knowledge for Front-End E

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High Performance Web Sites: Essential Knowledge for Front-End Engineers

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Type.................: Ebook

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From the Publisher

Want your web site to display more quickly? This book presents 14 specific rules

that will cut 20% to 25% off response time when users request a page. Author

Steve Souders, in his job as Chief Performance Yahoo!, collected these best

practices while optimizing some of the most-visited pages on the Web. Even sites

that had already been highly optimized, such as Yahoo! Search and the Yahoo!

Front Page, were able to benefit from these surprisingly simple performance

guidelines. The rules in High Performance Web Sites explain how you can optimize

the performance of the Ajax, CSS, JavaScript, Flash, and images that you've

already built into your site -- adjustments that are critical for any rich web

application. Other sources of information pay a lot of attention to tuning web

servers, databases, and hardware, but the bulk of display time is taken up on

the browser side and by the communication between server and browser. High

Performance Web Sites covers every aspect of that process. Each performance rule

is supported by specific examples, and code snippets are available on the book's

companion web site. The rules include how to: Make Fewer HTTP Requests Use a

Content Delivery Network Add an Expires Header Gzip Components Move Stylesheets

at the Top Move Scripts to the Bottom Avoid CSS Expressions Make JavaScript and

CSS External Reduce DNS Lookups Minify JavaScript Avoid Redirects Remove

Duplicates Scripts Configure ETags Make Ajax Cacheable If you're building pages

for high traffic destinations and want to optimize the experience of users

visiting their site, this book is indispensable. "If everyone would implement

just 20% of Steve's guidelines, the Web would be a dramaticallybetterplace.

Between this book and Steve's YSlow extension, there's really no excuse for

having a sluggish web site anymore." -Joe Hewitt, Developer of Firebug debugger

and Mozilla's DOM Inspector "Steve Souders has done a fantastic job of

distilling a massive, semi-arcane art down to a set of concise, actionable,

pragmatic engineering steps that will change the world of web performance."

-Eric Lawrence, Developer of the Fiddler Web Debugger, Microsoft Corporation

Chapter 1. The Importance of Frontend Performance

Section 1.1. Tracking Web Page Performance

Section 1.2. Where Does the Time Go?

Section 1.3. The Performance Golden Rule

Chapter 2. HTTP Overview

Section 2.1. Compression

Section 2.2. Conditional GET Requests

Section 2.3. Expires

Section 2.4. Keep-Alive

Section 2.5. There's More

Chapter 3. Rule 1: Make Fewer HTTP Requests

Section 3.1. Image Maps

Section 3.2. CSS Sprites

Section 3.3. Inline Images

Section 3.4. Combined Scripts and Stylesheets

Section 3.5. Conclusion

Chapter 4. Rule 2: Use a Content Delivery Network

Section 4.1. Content Delivery Networks

Section 4.2. The Savings

Chapter 5. Rule 3: Add an Expires Header

Section 5.1. Expires Header

Section 5.2. Max-Age and mod_expires

Section 5.3. Empty Cache vs. Primed Cache

Section 5.4. More Than Just Images

Section 5.5. Revving Filenames

Section 5.6. Examples

Chapter 6. Rule 4: Gzip Components

Section 6.1. How Compression Works

Section 6.2. What to Compress

Section 6.3. The Savings

Section 6.4. Configuration

Section 6.5. Proxy Caching

Section 6.6. Edge Cases

Section 6.7. Gzip in Action

Chapter 7. Rule 5: Put Stylesheets at the Top

Section 7.1. Progressive Rendering

Section 7.2. sleep.cgi

Section 7.3. Blank White Screen

Section 7.4. Flash of Unstyled Content

Section 7.5. What's a Frontend Engineer to Do?

Chapter 8. Rule 6: Put Scripts at the Bottom

Section 8.1. Problems with Scripts

Section 8.2. Parallel Downloads

Section 8.3. Scripts Block Downloads

Section 8.4. Worst Case: Scripts at the Top

Section 8.5. Best Case: Scripts at the Bottom

Section 8.6. Putting It in Perspective

Chapter 9. Rule 7: Avoid CSS Expressions

Section 9.1. Updating Expressions

Section 9.2. Working Around the Problem

Section 9.3. Conclusion

Chapter 10. Rule 8: Make JavaScript and CSS External

Section 10.1. Inline vs. External

Section 10.2. Typical Results in the Field

Section 10.3. Home Pages

Section 10.4. The Best of Both Worlds

Chapter 11. Rule 9: Reduce DNS Lookups

Section 11.1. DNS Caching and TTLs

Section 11.2. The Browser's Perspective

Section 11.3. Reducing DNS Lookups

Chapter 12. Rule 10: Minify JavaScript

Section 12.1. Minification

Section 12.2. Obfuscation

Section 12.3. The Savings

Section 12.4. Examples

Section 12.5. Icing on the Cake

Chapter 13. Rule 11: Avoid Redirects

Section 13.1. Types of Redirects

Section 13.2. How Redirects Hurt Performance

Section 13.3. Alternatives to Redirects

Chapter 14. Rule 12: Remove Duplicate Scripts

Section 14.1. Duplicate ScriptsΓ??They Happen

Section 14.2. Duplicate Scripts Hurt Performance

Section 14.3. Avoiding Duplicate Scripts

Chapter 15. Rule 13: Configure ETags

Section 15.1. What's an ETag?

Section 15.2. The Problem with ETags

Section 15.3. ETags: Use 'Em or Lose 'Em

Section 15.4. ETags in the Real World

Chapter 16. Rule 14: Make Ajax Cacheable

Section 16.1. Web 2.0, DHTML, and Ajax

Section 16.2. Asynchronous = Instantaneous?

Section 16.3. Optimizing Ajax Requests

Section 16.4. Caching Ajax in the Real World

Chapter 17. Deconstructing 10 Top Sites

Section 17.1. Page Weight, Response Time, YSlow Grade

Section 17.2. How the Tests Were Done

Section 17.3. Amazon

Section 17.4. AOL

Section 17.5. CNN

Section 17.6. eBay

Section 17.7. Google

Section 17.8. MSN

Section 17.9. MySpace

Section 17.10. Wikipedia

Section 17.11. Yahoo!

Section 17.12. YouTube

About the Author

Colophon

Index

Product Details

* ISBN: 0596529309

* ISBN-13: 9780596529307

* Format: Paperback, 146pp

* Publisher: O'Reilly Media, Incorporated

* Pub. Date: September 2007

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