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High Performance Web Sites
Год: 2007 Автор: Steve Souders Издательство: O''Reilly Media ISBN: 978-0-596-15876-7 Язык: Английский Формат: PDF, EPUB Качество: Изначально компьютерное (eBook) Интерактивное оглавление: Да Количество страниц: 170 Описание: Want your web site to display more quickly? This book presents 14 specific rules that will cut 25% to 50% 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.
Chapter 1 The Importance of Frontend Performance Tracking Web Page Performance Where Does the Time Go? The Performance Golden Rule Chapter 2 HTTP Overview Compression Conditional GET Requests Expires Keep-Alive There''s More Chapter 3 Rule 1: Make Fewer HTTP Requests Image Maps CSS Sprites Inline Images Combined Scripts and Stylesheets Conclusion Chapter 4 Rule 2: Use a Content Delivery Network Content Delivery Networks The Savings Chapter 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 Chapter 6 Rule 4: Gzip Components How Compression Works What to Compress The Savings Configuration Proxy Caching Edge Cases Gzip in Action Chapter 7 Rule 5: Put Stylesheets at the Top Progressive Rendering sleep.cgi Blank White Screen Flash of Unstyled Content What''s a Frontend Engineer to Do? Chapter 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 Chapter 9 Rule 7: Avoid CSS Expressions Updating Expressions Working Around the Problem Conclusion Chapter 10 Rule 8: Make JavaScript and CSS External Inline vs. External Typical Results in the Field Home Pages The Best of Both Worlds Chapter 11 Rule 9: Reduce DNS Lookups DNS Caching and TTLs The Browser''s Perspective Reducing DNS Lookups Chapter 12 Rule 10: Minify JavaScript Minification Obfuscation The Savings Examples Icing on the Cake Chapter 13 Rule 11: Avoid Redirects Types of Redirects How Redirects Hurt Performance Alternatives to Redirects Chapter 14 Rule 12: Remove Duplicate Scripts Duplicate Scripts—They Happen Duplicate Scripts Hurt Performance Avoiding Duplicate Scripts Chapter 15 Rule 13: Configure ETags What''s an ETag? The Problem with ETags ETags: Use ''Em or Lose ''Em ETags in the Real World Chapter 16 Rule 14: Make Ajax Cacheable Web 2.0, DHTML, and Ajax Asynchronous = Instantaneous? Optimizing Ajax Requests Caching Ajax in the Real World Chapter 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 Colophon
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