Steve Souders

Even Faster Web Sites (eBook, ePUB)

Performance Best Practices for Web Developers

• Format: ePub

Produktbeschreibung

Performance is critical to the success of any web site, and yet today's web applications push browsers to their limits with increasing amounts of rich content and heavy use of Ajax. In this book, Steve Souders, web performance evangelist at Google and former Chief Performance Yahoo!, provides valuable techniques to help you optimize your site's performance.Souders' previous book, the bestselling High Performance Web Sites, shocked the web development world by revealing that 80% of the time it takes for a web page to load is on the client side. In Even Faster Web Sites, Souders and eight expert contributors provide best practices and pragmatic advice for improving your site's performance in three critical categories:JavaScriptGet advice for understanding Ajax performance, writing efficient JavaScript, creating responsive applications, loading scripts without blocking other components, and more.NetworkLearn to share resources across multiple domains, reduce image size without loss of quality, and use chunked encoding to render pages faster.BrowserDiscover alternatives to iframes, how to simplify CSS selectors, and other techniques.Speed is essential for today's rich media web sites and Web 2.0 applications. With this book, you'll learn how to shave precious seconds off your sites' load times and make them respond even faster.This book contains six guest chapters contributed by Dion Almaer, Doug Crockford, Ben Galbraith, Tony Gentilcore, Dylan Schiemann, Stoyan Stefanov, Nicole Sullivan, and Nicholas C. Zakas.

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Produktdetails

• Verlag: O'Reilly Media
• Seitenzahl: 256
• Erscheinungstermin: 4. Juni 2009
• Englisch
• ISBN-13: 9780596555849
• Artikelnr.: 37827756

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
Chapter 1 Understanding Ajax Performance
Trade-offs
Principles of Optimization
Ajax
Browser
Wow!
JavaScript
Summary
Chapter 2 Creating Responsive Web Applications
What Is Fast Enough?
Measuring Latency
Threading
Ensuring Responsiveness
Summary
Chapter 3 Splitting the Initial Payload
Kitchen Sink
Savings from Splitting
Finding the Split
Undefined Symbols and Race Conditions Case Study: Google Calendar
Chapter 4 Loading Scripts Without Blocking
Scripts Block
Making Scripts Play Nice
Browser Busy Indicators
Ensuring (or Avoiding) Ordered Execution
Summarizing the Results
And the Winner Is
Chapter 5 Coupling Asynchronous Scripts
Code Example: menu.js
Race Conditions
Preserving Order Asynchronously
Multiple External Scripts
General Solution
Asynchronicity in the Real World
Chapter 6 Positioning Inline Scripts
Inline Scripts Block
Preserving CSS and JavaScript Order
Danger: Stylesheet Followed by Inline Script
Chapter 7 Writing Efficient JavaScript
Managing Scope
Efficient Data Access
Flow Control
String Optimization
Avoid Long-Running Scripts
Summary
Chapter 8 Scaling with Comet
How Comet Works
Transport Techniques
Cross-Domain
Effects of Implementation on Applications
Summary
Chapter 9 Going Beyond Gzipping
Why Does This Matter?
What Causes This?
How to Help These Users?
Chapter 10 Optimizing Images
Two Steps to Simplify Image Optimization
Image Formats
Automated Lossless Image Optimization
Alpha Transparency: Avoid AlphaImageLoader
Optimizing Sprites
Other Image Optimizations
Summary
Chapter 11 Sharding Dominant Domains
Critical Path
Who s Sharding?
Downgrading to HTTP/1.0
Rolling Out Sharding
Chapter 12 Flushing the Document Early
Flush the Head
Output Buffering
Chunked Encoding
Flushing and Gzip
Other Intermediaries
Domain Blocking During Flushing
Browsers: The Last Hurdle
Flushing Beyond PHP
The Flush Checklist
Chapter 13 Using Iframes Sparingly
The Most Expensive DOM Element
Iframes Block Onload
Parallel Downloads with Iframes
Connections per Hostname
Summarizing the Cost of Iframes
Chapter 14 Simplifying CSS Selectors
Types of Selectors
The Key to Efficient CSS Selectors
CSS Selector Performance
Measuring CSS Selectors in the Real World Appendix Performance Tools
Packet Sniffers
Web Development Tools
Performance Analyzers
Miscellaneous
Colophon

Rezensionen

"Es handelt sich um ein hochspezialisiertes Buch für Webentwickler, die hauptsächlich mit JavaScript arbeiten.[...] Wer aber bereits einige Arbeit in die Optimierung einer komplexen Site investiert hat und die restlichen zehn Prozent Performance auch noch braucht, der sollte sich diesen Titel ansehen." -- Linux-Magazin, September 2009