Preface
Vigilant: alertly watchful, especially to avoid danger
Anyone browsing this book—or its predecessor, High Performance Web Sites—understands the dangers of a slow web site: frustrated users, negative brand perception, increased operating expenses, and loss of revenue. We have to constantly work to make our web sites faster. As we make progress, we also lose ground. We have to be alert for the impact of each bug fix, new feature, and system upgrade on our web site’s speed. We have to be watchful, or the performance improvements made today can easily be lost tomorrow. We have to be vigilant.
Vigil: watch kept on a festival eve
According to the Latin root of vigil, our watch ends with celebration. Web sites can indeed be faster—dramatically so—and we can celebrate the outcome of our care and attention. It’s true! Making web sites faster is attainable. Some of the world’s most popular web sites have reduced their load times by 60% using the techniques described in this book. Smaller web properties benefit as well. Ultimately, users benefit.
Vigilante: a self-appointed doer of justice
It’s up to us as developers to guard our users’ interests. At your site, evangelize performance. Implement these techniques. Share this book with a coworker. Fight for a faster user experience. If your company doesn’t have someone focused on performance, appoint yourself to that role. Performance vigilante—I like the sound of that.
How This Book Is Organized
This book is a follow-up to my first book,
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