Web Performance Daybook V2

Foreword;
From the Editor;
About the Authors;
Patrick Meenan;
Nicholas Zakas;
Guy Podjarny;
Stoyan Stefanov;
Tim Kadlec;
Brian Pane;
Josh Fraser;
Steve Souders;
Betty Tso;
Israel Nir;
Marcel Duran;
Éric Daspet;
Alois Reitbauer;
Matthew Prince;
Buddy Brewer;
Alexander Podelko;
Estelle Weyl;
Aaron Peters;
Tony Gentilcore;
Matthew Steele;
Bryan McQuade;
Tobie Langel;
Billy Hoffman;
Joshua Bixby;
Sergey Chernyshev;
JP Castro;
Pavel Paulau;
David Calhoun;
Nicole Sullivan;
James Pearce;
Tom Hughes-Croucher;
Dave Artz;
Preface;
Conventions Used in This Book;
Using Code Examples;
Safari® Books Online;
How to Contact Us;
Chapter 1: WebPagetest Internals;
1.1 Function Interception;
1.2 Code Injection;
1.3 Resulting Browser Architecture;
1.4 Get the Code;
1.5 Browser Advancements;
Chapter 2: localStorage Read Performance;
2.1 The Benchmark;
2.2 What’s Going On?;
2.3 Optimization Strategy;
2.4 Follow Up;
Chapter 3: Why Inlining Everything Is NOT the Answer;
3.1 No Browser Caching;
3.2 No Edge Caching;
3.3 No Loading On-Demand;
3.4 Invalidates Browser Look-Ahead;
3.5 Flawed Solution: Inline Everything only on First Visit;
3.6 Summary and Recommendations;
Chapter 4: The Art and Craft of the Async Snippet;
4.1 The Facebook Plug-ins JS SDK;
4.2 Design Goals;
4.3 The Snippet;
4.4 Appending Alternatives;
4.5 Whew!;
4.6 What’s Missing?;
4.7 First Parties;
4.8 Parting Words: On the Shoulders of Giants;
Chapter 5: Carrier Networks: Down the Rabbit Hole;
5.1 Variability;
5.2 Latency;
5.3 Transcoding;
5.4 Gold in Them There Hills;
5.5 4G Won’t Save Us;
5.6 Where Do We Go from Here?;
5.7 Light at the End of the Tunnel;
Chapter 6: The Need for Parallelism in HTTP;
6.1 Introduction: Falling Down the Stairs;
6.2 Current Best Practices: Working around HTTP;
6.3 Experiment: Mining the HTTP Archive;
6.4 Results: Serialization Abounds;
6.5 Recommendations: Time to Fix the Protocols;
Chapter 7: Automating Website Performance;
Chapter 8: Frontend SPOF in Beijing;
8.1 Business Insider;
8.2 CNET;
8.3 O’Reilly Radar;
8.4 The Cause of Frontend SPOF;
8.5 Avoiding Frontend SPOF;
8.6 Call to Action;
Chapter 9: All about YSlow;
Chapter 10: Secrets of High Performance Native Mobile Applications;
10.1 Keep an Eye on Your Waterfalls;
10.2 Compress Those Resources;
10.3 Don’t Download the Same Content Twice;
10.4 Can Too Much Adriana Lima Slow You Down?;
10.5 Epilogue;
Chapter 11: Pure CSS3 Images? Hmm, Maybe Later;
11.1 The Challenge;
11.2 Getting My Hands Dirty with CSS3 Cooking;
11.3 Cross-Browser Results;
11.4 Benchmarking;
11.5 Are We There Yet?;
11.6 Appendix: Code Listings;
Chapter 12: Useless Downloads of Background Images in Android;
12.1 The Android Problem;
12.2 And the Lack of Solution;
Chapter 13: Timing the Web;
13.1 Conclusion;
Chapter 14: I See HTTP;
14.1 icy;
14.2 Some details;
14.3 Walkthrough;
14.4 Todos;
14.5 The Road Ahead;
14.6 All I Want for Christmas…;
Chapter 15: Using Intelligent Caching to Avoid the Bot Performance Tax;
Chapter 16: A Practical Guide to the Navigation Timing API;
16.1 Why You Should Care;
16.2 Collecting Navigation Timing Timestamps and Turning Them into Useful Measurements;
16.3 Using Google Analytics as a Performance Data Warehouse;
16.4 Reporting on Performance in Google Analytics;
16.5 Limitations;
16.6 Final Thoughts;
Chapter 17: How Response Times Impact Business;
Chapter 18: Mobile UI Performance Considerations;
18.1 Battery Life;
18.2 Latency;
18.3 Embedding CSS and JS: A Best Practice?;
18.4 Memory;
18.5 UI Responsiveness;
18.6 Summary;
Chapter 19: Stop Wasting Your Time Using the Google Analytics Site Speed Report;
19.1 Problem: A Bug in Firefox Implementation of the Navigation Timing API;
19.2 Solution: Filter Out the Firefox Timings in Google Analytics;
19.3 Good News: The Bug Was Fixed in Firefox 9;
19.4 Closing Remark;
Chapter 20: Beyond Web Developer Tools: Strace;
20.1 What About Other Platforms?;
20.2 Getting Started;
20.3 Zeroing In;
20.4 Example: Local Storage;
20.5 We’ve Only Scratched the Surface;
Chapter 21: Introducing mod_spdy: A SPDY Module for the Apache HTTP Server;
21.1 Getting Started with mod_spdy;
21.2 SPDY and Apache;
21.3 Help to Improve mod_spdy;
Chapter 22: Lazy Evaluation of CommonJS Modules;
22.1 Close Encounters of the Text/JavaScript Type;
22.2 Lazy Loading;
22.3 Lazy Evaluation to the Rescue;
22.4 Building Lazy Evaluation into CommonJS Modules;
Chapter 23: Advice on Trusting Advice;
Chapter 24: Why You’re Probably Reading Your Performance Measurement Results Wrong (At Least You’re in Good Company);
24.1 The Methodology;
24.2 The Results;
24.3 Conclusions;
24.4 Why Does This Matter?;
24.5 Takeaways;
Chapter 25: Lossy Image Compression;
25.1 Lossy Compression;
Chapter 26: Performance Testing with Selenium and JavaScript;
26.1 Recording Data;
26.2 Collecting and Analyzing the Data;
26.3 Sample Results;
26.4 Benefits;
26.5 Closing Words;
26.6 Credits;
Chapter 27: A Simple Way to Measure Website Performance;
27.1 Concept;
27.2 Advantages;
27.3 Limitation;
27.4 Conclusion;
Chapter 28: Beyond Bandwidth: UI Performance;
28.1 Introduction;
28.2 After the Page Loads: The UI Layer;
28.3 UI Profilers;
28.4 Perception of Speed;
28.5 Tidbits;
28.6 Call for a Focus on UI Performance;
Chapter 29: CSS Selector Performance Has Changed! (For the Better);
29.1 Style Sharing;
29.2 Rule Hashes;
29.3 Ancestor Filters;
29.4 Fast Path;
29.5 What Is It Still Slow?;
Chapter 30: Losing Your Head with PhantomJS and confess.js;
30.1 Performance Summaries;
30.2 App Cache Manifest;
30.3 Onward and Upward;
Chapter 31: Measure Twice, Cut Once;
31.1 Identifying Pages/Sections;
31.2 Identifying Features;
31.3 Optimizing;
Chapter 32: When Good Backends Go Bad;
32.1 What Is a Good Backend Time?;
32.2 Figuring Out What Is Going On;
32.3 Fixing It;
32.4 Finally;
Chapter 33: Web Font Performance: Weighing @font-face Options and Alternatives;
33.1 Font Hosting Services Versus Rolling Your Own;
33.2 What the FOUT?;
33.3 Removing Excess Font Glyphs;
33.4 JavaScript Font Loaders;
33.5 Gentlefonts, Start Your Engines!;
33.6 Final Thoughts;
Colophon;