Even Faster Web Sites: Performance Best Practices for Web Developers

Going beyond the excellent work in his first book _High Performance Web Sites: Essential Knowledge for Front-End Engineers_, this book includes great information on how to parallelize Javascript, minimize images, sprite images and write your web pages so that they don't block on one element. This along with the more basic stuff in his first book, like turning on compression, has speed up our page delivery times by a factor of 50%. Remember that every 1 second longer your page loads costs you 10% of your users and you can use this book to convince management to invest resources in speeding up your site.

This book was referred to me by a friend. I have been browsing internet for resources that will address the performance of web in simple and easy to implement way. I did find some articles and videos on that subject. All the articles and videos were about one or two particular topics for web site optimization. This books covers the whole science of website speed and performances in detail. The book lays the foundation and tries to make us understand the stake holders and important concepts. Then it takes each aspect and covers in detail. You will get the feeling as if you knew too little in some areas. This book gives you good understanding and solution for different types of web site. I allows us to think in more web browser perspective. We as developers have always thought of accomplishing the business requirement and not focusing on how a browser will react. Excellent book. I recommend this to everyone. Must have for any web development shop. Good Luck!

Today's Web developer knows that the speed of one's site is an important measure to its overall success, and Steve Souders' previous book, /High Performance Web Sites/ (O'Reilly), laid out what seemed to be every way to achieve good performance gains without the sacrifice of functionality or aesthetics. When I began reading Souders' /Even Faster Web Sites/, I therefore wondered how he could possibly demonstrate fresh ways to achieve performance gains without regurgitating the content of his previous book. What I discovered as I read /Even Faster Web Sites/ was it presented all new best practices for making your web sites "leaner and meaner" without repeating the content of his last book. /Even Faster Web Sites/ takes the latest techniques available to developers and organizes them into three performance areas: JavaScript, network, and browser. Though I believe Souder knows what he is talking about regarding web site performance, I found it refreshing this time around that he had the contributions of other experts in the field to give their ideas on performance gains in these areas. I thought the chapters on JavaScript, especially those discussing Ajax and asynchronous techniques, were well written and gave good, new best practices to trim time off the loading of content on a site. I also appreciated the chapter dealing with Comet, as these technologies are surely a driving force for future web applications, and having best practices early in their development will only help their progress. Of the two chapters on browser performance, I found the honesty of the discussion on the downsides of using iframes most helpful, especially when their use was discussed as a viable technique for improving performance early in the book. I did find the chapter on CSS selectors extremely useful for analyzing where slowdowns in styling may exist based on browser implementation. The chapters on network performance gave a good background on common hindrances such as connection limits and poor image choices, but also walked through what I felt were performance gains that can be made through less utilized techniques like chunked encoding and better compression. Souder finished this book with an Appendix on performance tools that can be used to help in the improvement of a web site, which I found to be immensely helpful. While many tools he listed are well known to developers, there are some I was unaware of and began making use of immediately on my own sites. /Even Faster Web Sites/ is an excellent follow-up to High Performance Web Sites, giving new best practices for making your web sites even faster. As I see it, even hundredths of a second begin to add up when you put all of these techniques together, and most of the techniques presented in this book are practical for any web site being developed. I would recommend this book to any developer looking for ways to improve the performance of his web site, as Souder has certainly demonstrated his knowledge an

I've produced Web sites for 15 years. In the "old days" it was routine to test new Web pages on a dial-up connection. Today few developers have access to dial-up for testing. Yes you can load test and calculate the time to render a page on different connections but you'll miss the look in the developers eyes while he stares at the screen waiting for a page to render. It's a good way to be sure that developers experience their work from the customers point-of-view, all customers. So the next time you're told by a developer, "oh it doesn't matter, everyone has broadband" take away their broadband for a week and make them read this book while waiting for their pages to load. This book provides practical instruction on how to optimize your code for a better user experience, on broadband or not. This is written for developers but is also useful information for business managers who can demand faster performance from their Web sites and their developers.

This book is a follow-on to Steve Souder's first book entitled "High Performance Web Sites". Whereas the first book was authored entirely by Steve Souder, this newer book contains chapters authored by other experts in Javascript, Ajax, and/or Network Performance. Comparatively speaking, I tend to think of the performance tuning techniques discussed in the first book as all relatively straightforward to implement, while those in this newer book as ranging from some that are relatively straightforward to implement (e.g., how to write efficient Javascript and CSS Selector code, how to optimize image sizes, and how to flush documents early to trigger initial web page rendering as soon as possible), to others that tend to be trickier to implement, involving either the use of: * lesser known http features (e.g., chunked encoding for incremental page rendering or low-latency data transfers from server to browser in support of near-realtime applications such as chat, stock quotes, etc), or * still evolving technologies (e.g., Google GEAR or Web Worker API for overcoming Javascript's single-threadedness to get more concurrent work done), or * not yet publicly released technologies (e.g., Microsoft Research's Doloto system that facilitates the "splitting and packaging" of a Javascript-intensive Web Application into a quick-loading initial component or cluster that enables early page rendering, and supporting payloads that are loaded more lazily or on-demand). One theme that runs throughout this newer book is that in order to squeeze more performance out of a next generation web application, developers would have to become more and more adept with using asynchronous techniques (which could involve tricky issues); by this I don't just mean using Ajax which could involve asynchronously pulling data from server to browser, but also asynchronous techniques for facilitating parallel component downloads, etc. Given the cutting-edge and more complex nature of some of the discussed techniques, this book is an invaluable aid to anyone itching to experiment: it lays out a problem, suggests approaches and related tools whenever appropriate (e.g., no access to Doloto?, here are alternative do-it-yourself implementation approaches), provides lots of sample code, calls out potential gotchas and how to workaround them, and then with the support of empirical data, tells you the relative pros and cons of each suggested approach. Highly recommended!