book

High Performance Web Sites

Name: High Performance Web Sites
Author: Steve Souders
ISBN: 9780596550691

by Steve Souders

September 2007

Intermediate to advanced

170 pages

4h 24m

English

O'Reilly Media, Inc.

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High Performance Web Sites
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Praise for High Performance Web Sites
Foreword
Preface
How This Book Is Organized
Conventions Used in This Book
Code Examples
Comments and Questions
Safari® Books Online
Acknowledgments

1. The Importance of Frontend Performance
Tracking Web Page Performance
Where Does the Time Go?
The Performance Golden Rule
2. HTTP Overview
Compression
Conditional GET Requests
Expires
Keep-Alive
There's More
3. Rule 1: Make Fewer HTTP Requests
Image Maps
CSS Sprites
Inline Images
Combined Scripts and Stylesheets
Conclusion
4. Rule 2: Use a Content Delivery Network
Content Delivery Networks
The Savings
5. Rule 3: Add an Expires Header
Expires Header
Max-Age and mod_expires
Empty Cache vs. Primed Cache
More Than Just Images
Revving Filenames
Examples
6. Rule 4: Gzip Components
How Compression Works
What to Compress
The Savings
Configuration
Apache 1.3: mod_gzipApache 2.x: mod_deflate
Proxy Caching
Edge Cases
Gzip in Action
7. Rule 5: Put Stylesheets at the Top
Progressive Rendering
sleep.cgi
Blank White Screen
CSS at the BottomCSS at the Top
Flash of Unstyled Content
What's a Frontend Engineer to Do?
8. Rule 6: Put Scripts at the Bottom
Problems with Scripts
Parallel Downloads
Scripts Block Downloads
Worst Case: Scripts at the Top
Best Case: Scripts at the Bottom
Putting It in Perspective
9. Rule 7: Avoid CSS Expressions
Updating Expressions
Working Around the Problem
One-Time ExpressionsEvent Handlers
Conclusion
10. Rule 8: Make JavaScript and CSS External
Inline vs. ExternalIn Raw Terms, Inline Is FasterPage ViewsEmpty Cache vs. Primed CacheComponent Reuse
Typical Results in the Field
Home Pages
The Best of Both Worlds
Post-Onload DownloadDynamic Inlining
11. Rule 9: Reduce DNS Lookups
DNS Caching and TTLsFactors Affecting DNS CachingTTL Values
The Browser's Perspective
Internet ExplorerFirefox
Reducing DNS Lookups
12. Rule 10: Minify JavaScript
Minification
Obfuscation
The Savings
Examples
Icing on the Cake
Inline ScriptsGzip and MinificationMinifying CSS
13. Rule 11: Avoid Redirects
Types of Redirects
How Redirects Hurt Performance
Alternatives to Redirects
Missing Trailing SlashConnecting Web SitesTracking Internal TrafficTracking Outbound TrafficPrettier URLs
14. Rule 12: Remove Duplicate Scripts
Duplicate Scripts—They Happen
Duplicate Scripts Hurt Performance
Avoiding Duplicate Scripts
15. Rule 13: Configure ETags
What's an ETag?Expires HeaderConditional GET RequestsLast-Modified DateEntity Tags
The Problem with ETags
ETags: Use 'Em or Lose 'Em
ETags in the Real World
16. Rule 14: Make Ajax Cacheable
Web 2.0, DHTML, and AjaxWeb 2.0DHTMLAjax
Asynchronous = Instantaneous?
Optimizing Ajax Requests
Caching Ajax in the Real World
Yahoo! MailGoogle Spreadsheets
17. Deconstructing 10 Top Sites
Page Weight, Response Time, YSlow Grade
How the Tests Were Done
Amazon
AOL
CNN
eBay
Google
MSN
MySpace
Wikipedia
Yahoo!
YouTube
Index
About the Author
Colophon
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High Performance Web Sites

by Steve Souders

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