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High Performance Web Sites - Steve Souders
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Problems with Scripts

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2022-02-24 01:17:40
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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_gzip
      • Apache 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 Bottom
      • CSS 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 Expressions
      • Event Handlers
    • Conclusion
  • 10. Rule 8: Make JavaScript and CSS External
    • Inline vs. External
      • In Raw Terms, Inline Is Faster
      • Page Views
      • Empty Cache vs. Primed Cache
      • Component Reuse
    • Typical Results in the Field
    • Home Pages
    • The Best of Both Worlds
      • Post-Onload Download
      • Dynamic Inlining
  • 11. Rule 9: Reduce DNS Lookups
    • DNS Caching and TTLs
      • Factors Affecting DNS Caching
      • TTL Values
    • The Browser's Perspective
      • Internet Explorer
      • Firefox
    • Reducing DNS Lookups
  • 12. Rule 10: Minify JavaScript
    • Minification
    • Obfuscation
    • The Savings
    • Examples
    • Icing on the Cake
      • Inline Scripts
      • Gzip and Minification
      • Minifying CSS
  • 13. Rule 11: Avoid Redirects
    • Types of Redirects
    • How Redirects Hurt Performance
    • Alternatives to Redirects
      • Missing Trailing Slash
      • Connecting Web Sites
      • Tracking Internal Traffic
      • Tracking Outbound Traffic
      • Prettier 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 Header
      • Conditional GET Requests
      • Last-Modified Date
      • Entity 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 Ajax
      • Web 2.0
      • DHTML
      • Ajax
    • Asynchronous = Instantaneous?
    • Optimizing Ajax Requests
    • Caching Ajax in the Real World
      • Yahoo! Mail
      • Google 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
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