Steve Souders

High Performance Web Sites (eBook, ePUB)

Essential Knowledge for Front-End Engineers

• Format: ePub

Produktbeschreibung

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.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 RequestsUse a Content Delivery NetworkAdd an Expires HeaderGzip ComponentsPut Stylesheets at the TopPut Scripts at the BottomAvoid CSS ExpressionsMake JavaScript and CSS ExternalReduce DNS LookupsMinify JavaScriptAvoid RedirectsRemove Duplicates ScriptsConfigure ETagsMake Ajax CacheableIf you're building pages for high traffic destinations and want to optimize the experience of users visiting your site, this book is indispensable."e;If everyone would implement just 20% of Steve's guidelines, the Web would be adramatically better place. Between this book and Steve's YSlow extension, there's reallyno excuse for having a sluggish web site anymore."e;-Joe Hewitt, Developer of Firebug debugger and Mozilla's DOM Inspector"e;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."e;-Eric Lawrence, Developer of the Fiddler Web Debugger, Microsoft Corporation

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Produktdetails

• Verlag: O'Reilly Media
• Seitenzahl: 170
• Erscheinungstermin: 11. September 2007
• Englisch
• ISBN-13: 9780596550691
• Artikelnr.: 52927828

Autorenporträt

Steve Souders works at Google on web performance and open source initiatives. His books High Performance Web Sites and Even Faster Web Sites explain his best practices for performance along with the research and real-world results behind them. Steve is the creator of YSlow, the performance analysis extension to Firebug with more than 1 million downloads. He serves as co-chair of Velocity, the web performance and operations conference sponsored by O'Reilly. Steve taught CS193H: High Performance Web Sites at Stanford, and he frequently speaks at such conferences as OSCON, Rich Web Experience, Web 2.0 Expo, and The Ajax Experience. Steve previously worked at Yahoo! as the Chief Performance Yahoo!, where he blogged about web performance on Yahoo! Developer Network. He was named a Yahoo! Superstar. Steve worked on many of the platforms and products within the company, including running the development team for My Yahoo!. Prior to Yahoo! Steve worked at several small to mid-sized startups including two companies he co-founded, Helix Systems and CoolSync. He also worked at General Magic, WhoWhere?, and Lycos.

Inhaltsangabe

Inhaltsverzeichnis Foreword Preface A. The Importance of Frontend Performance Tracking Web Page Performance Where Does the Time Go? The Performance Golden Rule B. HTTP Overview Compression Conditional GET Requests Expires Keep-Alive There's More 1. Rule 1: Make Fewer HTTP Requests Image Maps CSS Sprites Inline Images Combined Scripts and Stylesheets Conclusion 2. Rule 2: Use a Content Delivery Network Content Delivery Networks The Savings 3. 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 4. Rule 4: Gzip Components How Compression Works What to Compress The Savings Configuration Proxy Caching Edge Cases Gzip in Action 5. 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? 6. 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 7. Rule 7: Avoid CSS Expressions Updating Expressions Working Around the Problem Conclusion 8. Rule 8: Make JavaScript and CSS External Inline vs. External Typical Results in the Field Home Pages The Best of Both Worlds 9. Rule 9: Reduce DNS Lookups DNS Caching and TTLs The Browser's Perspective Reducing DNS Lookups 10. Rule 10: Minify JavaScript Minification Obfuscation The Savings Examples Icing on the Cake 11. Rule 11: Avoid Redirects Types of Redirects How Redirects Hurt Performance Alternatives to Redirects 12. Rule 12: Remove Duplicate Scripts Duplicate Scripts-They Happen Duplicate Scripts Hurt Performance Avoiding Duplicate Scripts 13. Rule 13: Configure ETags What's an ETag? The Problem with ETags ETags: Use 'Em or Lose 'Em ETags in the Real World 14. Rule 14: Make Ajax Cacheable Web 2.0, DHTML, and Ajax Asynchronous = Instantaneous? Optimizing Ajax Requests Caching Ajax in the Real World 15. 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