Verfügbarkeit: Even faster web sites | Technische Universität München

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Bibliographische Detailangaben
Beteilige Person:	Souders, Steve (VerfasserIn)
Format:	Buch
Sprache:	Englisch
Veröffentlicht:	Sebastopol, CA [u.a.] O'Reilly 2009
Ausgabe:	1. ed.
Links:	http://deposit.dnb.de/cgi-bin/dokserv?id=3281323&prov=M&dok_var=1&dok_ext=htm http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=018600741&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA
Umfang:	XIX, 231 S. Ill., graph. Darst., Kt.
ISBN:	9780596522308

Internformat

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Datensatz im Suchindex

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adam_text	Titel: Even faster web sites Autor: Souders, Steve Jahr: 2009 Table of Contents Credits xi Preface xiii 1. Understanding Ajax Performance 1 Trade-offs 1 Principles of Optimization 1 Ajax 4 Browser 4 Wow! 5 JavaScript 6 Summary 6 2. Creating Responsive Web Applications 7 What Is Fast Enough? 9 Measuring Latency 10 When Latency Goes Bad 12 Threading 12 Ensuring Responsiveness 13 Web Workers 14 Gears 14 Timers 16 Effects of Memory Use on Response Time 17 Virtual Memory 18 Troubleshooting Memory Issues 18 Summary 19 3. Splitting the Initial Payload 21 Kitchen Sink 21 Savings from Splitting 22 Finding the Split 23 Undefined Symbols and Race Conditions 24 Case Study: Google Calendar 25 4. Loading Scripts Without Blocking 27 Scripts Block 27 Making Scripts Play Nice 29 XHR Eval 29 XHR Injection 31 Script in Iframe 31 Script DOM Element 32 Script Defer 32 document.write Script Tag 33 Browser Busy Indicators 33 Ensuring (or Avoiding) Ordered Execution 35 Summarizing the Results 36 And the Winner Is 38 5. Coupling Asynchronous Scripts 41 Code Example: menu.js 42 Race Conditions 44 Preserving Order Asynchronously 45 Technique 1: Hardcoded Callback 46 Technique 2: Window Onload 47 Technique 3: Timer 48 Technique 4: Script Onload 49 Technique 5: Degrading Script Tags 50 Multiple External Scripts 52 Managed XHR 52 DOM Element and Doc Write 56 General Solution 59 Single Script 59 Multiple Scripts 60 Asynchronicity in the Real World 63 Google Analytics and Dojo 63 YUI Loader Utility 65 6. Positioning Inline Scripts 69 Inline Scripts Block 69 Move Inline Scripts to the Bottom 70 Initiate Execution Asynchronously 71 Use Script Defer 73 Preserving CSS and JavaScript Order 73 Danger: Stylesheet Followed by Inline Script 74 Inline Scripts Aren t Blocked by Most Downloads 74 Inline Scripts Are Blocked by Stylesheets 75 This Does Happen 77 7. Writing Efficient JavaScript 79 Managing Scope 79 Use Local Variables 81 Scope Chain Augmentation 83 Efficient Data Access 85 Flow Control 88 Fast Conditionals 89 Fast Loops 93 String Optimization 99 String Concatenation 99 Trimming Strings 100 Avoid Long-Running Scripts 102 Yielding Using Timers 103 Timer Patterns for Yielding 105 Summary 107 8. Scaling with Comet 109 How Comet Works 109 Transport Techniques 111 Polling HI Long Polling 112 Forever Frame 113 XHR Streaming 115 Future Transports 116 Cross-Domain 116 Effects of Implementation on Applications 118 Managing Connections 118 Measuring Performance 119 Protocols 119 Summary I-IO 9. Going Beyond Gzipping 121 Why Does This Matter? 121 What Causes This? 123 Quick Review The Culprit 123 Examples of Popular Turtle Tappers 124 How to Help These Users? 124 Design to Minimize Uncompressed Size 125 Educate Users 129 Direct Detection of Gzip Support 130 10. Optimizing Images 133 Two Steps to Simplify Image Optimization 134 Image Formats 135 Background 135 Characteristics of the Different Formats 137 More About PNG 139 Automated Lossless Image Optimization 141 Crushing PNGs 142 Stripping JPEG Metadata 143 Converting GIF to PNG 144 Optimizing GIF Animations 144 Smush.it 145 Progressive JPEGs for Large Images 145 Alpha Transparency: Avoid AlphalmageLoader 146 Effects of Alpha Transparency 147 AlphalmageLoader 149 Problems with AlphalmageLoader 150 Progressively Enhanced PNG8 Alpha Transparency 151 Optimizing Sprites 153 Uber-Sprite Versus Modular Sprite 154 Highly Optimized CSS Sprites 155 Other Image Optimizations 155 Avoid Scaling Images 155 Crush Generated Images 156 Favicons 157 Apple Touch Icon 158 Summary 159 11. Shading Dominant Domains 161 Critical Path 161 Who s Sharding? 163 Downgrading to HTTP/1.0 165 Rolling Out Sharding 168 IP Address or Hostname 168 How Many Domains 168 How to Split Resources 168 Newer Browsers 169 12. Flushing the Document Early 171 Flush the Head 171 Output Buffering 173 Chunked Encoding 175 Flushing and Gzip 176 Other Intermediaries 177 Domain Blocking During Flushing 178 Browsers: The Last Hurdle 178 Flushing Beyond PHP 179 The Flush Checklist 180 13. Using Iframes Sparingly 181 The Most Expensive DOM Element 181 Iframes Block Onload 182 Parallel Downloads with Iframes 184 Script Before Iframe 184 Stylesheet Before Iframe 185 Stylesheet After Iframe 186 Connections per Hostname 187 Connection Sharing in Iframes 187 Connection Sharing Across Tabs and Windows 188 Summarizing the Cost of Iframes 190 14. Simplifying CSS Selectors 191 Types of Selectors 191 ID Selectors 192 Class Selectors 193 Type Selectors 193 Adjacent Sibling Selectors 193 Child Selectors 193 Descendant Selectors 193 Universal Selectors 194 Attribute Selectors 194 Pseudo-Classes and Pseudo-Elements 194 The Key to Efficient CSS Selectors 194 Rightmost First 195 Writing Efficient CSS Selectors 195 CSS Selector Performance 197 Complex Selectors Impact Performance (Sometimes) 197 CSS Selectors to Avoid 200 ReflowTime 201 Measuring CSS Selectors in the Real World 202 Appendix: Performance Tools 205 Index 221
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spellingShingle	Souders, Steve Even faster web sites [performance best practices for web developers]
title	Even faster web sites [performance best practices for web developers]
title_auth	Even faster web sites [performance best practices for web developers]
title_exact_search	Even faster web sites [performance best practices for web developers]
title_full	Even faster web sites [performance best practices for web developers] Steve Souders
title_fullStr	Even faster web sites [performance best practices for web developers] Steve Souders
title_full_unstemmed	Even faster web sites [performance best practices for web developers] Steve Souders
title_short	Even faster web sites
title_sort	even faster web sites performance best practices for web developers
title_sub	[performance best practices for web developers]
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