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: * JavaScript-Get advice for understanding Ajax performance, writing efficient JavaScript, creating responsive applications, loading scripts without blocking other components, and more. * Network-Learn to share resources across multiple domains, reduce image size without loss of quality, and use chunked encoding to render pages faster. * Browser-Discover 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.
Even Faster Web Sites
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"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
Über den Autor
Steve Souders works at Google on web performance and open source initiatives. His book High Performance Web Sites explains 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. He is also co-chair of Velocity 2008, the first web performance conference sponsored by O'Reilly. 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. In the early 80's Steve caught the Artificial Intelligence bug and worked at a few companies doing research on Machine Learning, including several publications and conference appearances. He received a BS in Systems Engineering from the University of Virginia and a MS in Management Science and Engineering from Stanford University . Steve's interests are varied. He sits on the board of Freehand Systems and Fremont Hills Country Club . He teaches Sunday School at First Lutheran Church in Palo Alto. He's played basketball with several NBA and WNBA players. He was a member of the Universal Studios Internet Task Force. He participated in setting a Guinness world record. He rebuilt a 90-year-old carriage house. He has a wonderful wife and three daughters.
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Buchdeckel | Copyright | Inhaltsverzeichnis | Auszug | Stichwortverzeichnis | Rückseite
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Von Markus Leptien
Format:Taschenbuch
Wie auch bei seinem ersten Buch "High Performance Web Sites", ist mein Eindruck gespalten. Und vergebe trotzdem 5 Sterne.
Das Buch ist extrem wertvoll, in dem Sinne, das es einem unglaublich viel Zeit spart, und dem Webseiten-Betreiber in kürzester Zeit recht viel Geld sparen kann bzw. einbringen kann. Man sollte aber definitiv die Inhalte seines ersten Buches "High Performance Web Sites" hinter sich und implementiert haben. Denn die dort genannten 14 Regeln sind Basics, die wirklich einfach umzusetzen sind.
Das Problem diese Buches (wie auch des Vorgängers): Die Tipps sind so "knackig", das für den technisch versierten man das Thema wahrscheinlich auf knapp 15 Seiten zusammenfassen kann. Nur: Man kann kein Buch mit 15 Seiten verkaufen. So wird dann einiges drumrumgestrickt.
Das erste Kapitel widmet sich zum Beispiel dem Thema, daß man erstmal messen sollte, WAS eine Webseite so langsam macht. Und wenn die Base Page in 0,1 Sekunden lädt, und die eingebettete Grafik 10 Sekunden, man nicht bei der Base Page anfangen sollte zu optimieren. Dafür brauche ich dies Buch nicht.
Andererseits wird in einem Kapitel später illustriert, daß, bis auf eine Ausnahme, alle Browser externe Javascript-Dateien nur sequentiell herunterladen. Was bei den Javascript-lastigen Seiten heutzutage einen immensen Performance-Einfluß hat. Insbesondere, da die meisten Entwickler sie ihm HEAD platzieren, und damit ein frühes Rendering des Browsers unmöglich machen. Anschließend diskutiert er verschiedene Methoden, dies Problem zu umgehen. Und endet mit einem Entscheidungsbaum, welche Methode bei welcher Infrastruktur dieses Problem umgeht. Allein dieser Entscheidungsbaum, inklusive der in ihm eingegangenen zahlreichen Tests mit unterschiedlichen Browserversionen, kann (und ist es für mich) das Geld für dieses Buch wert (sein).
Dann wiederum folgt ein Kapitel, welches den Umstand beleuchtet, warum 15% aller Browser vermeintlich keine Kompression unterstützen. Es stellt sich heraus, es sind hauptsächlich Anfragen aus Russland, Vatikan und dem Nahen Osten. "Staatliche Proxies". Für einen Webseiten-Betreiber, dessen Zielgruppe nicht in diesen Ländern sitzt also eher unwichtig.
Dann wiederum erläutert Steve Souders, wie man Inhalte einbindet, die nachgeladen werden, NACHDEM der Browser das Dokument fertig gerendert hat (onload). Ohne Sanduhr, sich drehende Browserlogos, nicht endende wollende Fortschrittsanzeigen in der Status-Leiste des Browsers. Wiederum aufgeschlüsselt nach den verschiedenen Browser-Versionen und Fortschrittsindikatoren. Hier wieder: Alleine der Testaufwand, die verschiedenen Methoden gegen jede Browserversion getestet zu haben, rechtfertigt den Preis des Buches mehrfach.
Daher meine Einschätzung: Ich bin froh, das Buch gekauft zu haben, da wahrscheinlich die Inhalte von 15 Seiten allein einer Firma mehrere Tausend € sparen können. Entgegensetzen könnte man, daß man mit viel Know-How die Tipps auf 15 Seiten komprimieren oder mit extrem gezielter Suche im Web finden könnte.
Als Tipp: Sein Vortrag auf der Google I/O 2009 Conference ist als Video im Web. Dort trägt er einige Kapitel dieses Buches vor.
Das Buch ist extrem wertvoll, in dem Sinne, das es einem unglaublich viel Zeit spart, und dem Webseiten-Betreiber in kürzester Zeit recht viel Geld sparen kann bzw. einbringen kann. Man sollte aber definitiv die Inhalte seines ersten Buches "High Performance Web Sites" hinter sich und implementiert haben. Denn die dort genannten 14 Regeln sind Basics, die wirklich einfach umzusetzen sind.
Das Problem diese Buches (wie auch des Vorgängers): Die Tipps sind so "knackig", das für den technisch versierten man das Thema wahrscheinlich auf knapp 15 Seiten zusammenfassen kann. Nur: Man kann kein Buch mit 15 Seiten verkaufen. So wird dann einiges drumrumgestrickt.
Das erste Kapitel widmet sich zum Beispiel dem Thema, daß man erstmal messen sollte, WAS eine Webseite so langsam macht. Und wenn die Base Page in 0,1 Sekunden lädt, und die eingebettete Grafik 10 Sekunden, man nicht bei der Base Page anfangen sollte zu optimieren. Dafür brauche ich dies Buch nicht.
Andererseits wird in einem Kapitel später illustriert, daß, bis auf eine Ausnahme, alle Browser externe Javascript-Dateien nur sequentiell herunterladen. Was bei den Javascript-lastigen Seiten heutzutage einen immensen Performance-Einfluß hat. Insbesondere, da die meisten Entwickler sie ihm HEAD platzieren, und damit ein frühes Rendering des Browsers unmöglich machen. Anschließend diskutiert er verschiedene Methoden, dies Problem zu umgehen. Und endet mit einem Entscheidungsbaum, welche Methode bei welcher Infrastruktur dieses Problem umgeht. Allein dieser Entscheidungsbaum, inklusive der in ihm eingegangenen zahlreichen Tests mit unterschiedlichen Browserversionen, kann (und ist es für mich) das Geld für dieses Buch wert (sein).
Dann wiederum folgt ein Kapitel, welches den Umstand beleuchtet, warum 15% aller Browser vermeintlich keine Kompression unterstützen. Es stellt sich heraus, es sind hauptsächlich Anfragen aus Russland, Vatikan und dem Nahen Osten. "Staatliche Proxies". Für einen Webseiten-Betreiber, dessen Zielgruppe nicht in diesen Ländern sitzt also eher unwichtig.
Dann wiederum erläutert Steve Souders, wie man Inhalte einbindet, die nachgeladen werden, NACHDEM der Browser das Dokument fertig gerendert hat (onload). Ohne Sanduhr, sich drehende Browserlogos, nicht endende wollende Fortschrittsanzeigen in der Status-Leiste des Browsers. Wiederum aufgeschlüsselt nach den verschiedenen Browser-Versionen und Fortschrittsindikatoren. Hier wieder: Alleine der Testaufwand, die verschiedenen Methoden gegen jede Browserversion getestet zu haben, rechtfertigt den Preis des Buches mehrfach.
Daher meine Einschätzung: Ich bin froh, das Buch gekauft zu haben, da wahrscheinlich die Inhalte von 15 Seiten allein einer Firma mehrere Tausend € sparen können. Entgegensetzen könnte man, daß man mit viel Know-How die Tipps auf 15 Seiten komprimieren oder mit extrem gezielter Suche im Web finden könnte.
Als Tipp: Sein Vortrag auf der Google I/O 2009 Conference ist als Video im Web. Dort trägt er einige Kapitel dieses Buches vor.
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18 Rezensionen
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5.0 von 5 Sternen
Raising the performance bar up a notch
16. Juni 2009
Von Techie Evan
- Veröffentlicht auf Amazon.com
Format:Taschenbuch
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!
* 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!
10 von 10 Kunden fanden die folgende Rezension hilfreich
5.0 von 5 Sternen
Faster and Faster
11. August 2009
Von Anthony Holdener
- Veröffentlicht auf Amazon.com
Format:Taschenbuch
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 and expertise on improving the speed of a site.
/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 and expertise on improving the speed of a site.
5 von 5 Kunden fanden die folgende Rezension hilfreich
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After You've Mastered High Performance Web Sites
27. Mai 2010
Von Robert Szarka
- Veröffentlicht auf Amazon.com
Format:Taschenbuch|Von Amazon bestätigter Kauf
Steve Souders has been a leader in documenting and evangelizing techniques for improving web site performance, and his previous book High Performance Web Sites: Essential Knowledge for Front-End Engineers (or the web posting from which it evolved) is essential reading. Even Faster Web Sites is not an updating of that book, but a collection of additional advice from Souders and eight contributors. So the first thing to note is that you should probably only tackle this book if you've already mastered the techniques outlined in High Performance Web Sites.
The one exception to the advice above may be if you're a web developer who makes heavy use of Javascript, since over half of this book is devoted to AJAX. The remainder of the book addresses a variety of topics of interest to web development professionals in general--optimizing images, writing efficient CSS, advanced techniques for implementing gzipping, and more.
As with Souders previous book, there is little that will be new to professionals who've kept up with best practices via blogs and the like, but it's still nice to have all the information in one handy book. For those who are just starting to investigate web performance optimization, High Performance Web Sites plus Even Faster Web Sites will get you up to speed quickly.
The one exception to the advice above may be if you're a web developer who makes heavy use of Javascript, since over half of this book is devoted to AJAX. The remainder of the book addresses a variety of topics of interest to web development professionals in general--optimizing images, writing efficient CSS, advanced techniques for implementing gzipping, and more.
As with Souders previous book, there is little that will be new to professionals who've kept up with best practices via blogs and the like, but it's still nice to have all the information in one handy book. For those who are just starting to investigate web performance optimization, High Performance Web Sites plus Even Faster Web Sites will get you up to speed quickly.
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