By Steve Souders
Wish your website to demonstrate extra speedy? This e-book offers 14 particular principles that may lower 25% to 50% off reaction time whilst clients request a web page. writer Steve Souders, in his task as leader functionality Yahoo!, accrued those top practices whereas optimizing the various most-visited pages on the net. Even websites that had already been hugely optimized, comparable to Yahoo! seek and the Yahoo! entrance web page, have been capable of make the most of those strangely uncomplicated functionality guidelines.
Each functionality rule is supported by means of particular examples, and code snippets can be found at the book's significant other site. the foundations contain how to:
* Make Fewer HTTP Requests
* Use a content material supply Network
* upload an Expires Header
* Gzip Components
* positioned Stylesheets on the Top
* positioned Scripts on the Bottom
* keep away from CSS Expressions
* lessen DNS Lookups
* stay away from Redirects
* eliminate Duplicates Scripts
* Configure ETags
* Make Ajax Cacheable
If you're development pages for prime site visitors locations and need to optimize the event of clients vacationing your web site, this ebook is indispensable.
"If every person might enforce simply 20% of Steve's directions, the internet will be a dramatically higher position. among this booklet and Steve's YSlow extension, there's fairly no excuse for having a slow site anymore."
-Joe Hewitt, Developer of Firebug debugger and Mozilla's DOM Inspector
"Steve Souders has performed a ravishing activity of distilling a big, semi-arcane paintings right down to a suite of concise, actionable, pragmatic engineering steps that may switch the realm of net performance."
-Eric Lawrence, Developer of the Fiddler internet Debugger, Microsoft company
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• a pragmatic advisor to writing and utilizing APIs to import or export info
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Extra info for High Performance Web Sites: Essential Knowledge for Front-End Engineers
For example, based on the assumption that most web companies choose a data center close to their offices, your web client at work is probably located close to your current web servers. Thus, if you run a test from your browser at work, the response times without using a CDN are often best case. It’s important to remember that most of your users are not located that close to your web servers. To measure the true impact of switching to a CDN, you need to measure the response times from multiple geographic locations.
In this chapter, I describe techniques for eliminating HTTP requests while avoiding the difficult tradeoff decisions between performance and design. These techniques include using image maps, CSS sprites, inline images, and combined scripts and stylesheets. Using these techniques reduces response times of the example pages by as much as 50%. Image Maps In its simplest form, a hyperlink associates the destination URL with some text. A prettier alternative is to associate the hyperlink with an image, for example in navbars and buttons.
Com. Browsers that support deflate also support gzip, but several browsers that support gzip do not support deflate, so gzip is the preferred method of compression. What to Compress Servers choose what to gzip based on file type, but are typically too limited in what they are configured to compress. Many web sites gzip their HTML documents. It’s also worthwhile to gzip your scripts and stylesheets, but many web sites miss this opportunity (in fact, it’s worthwhile to compress any text response including XML and JSON, but the focus here is on scripts and stylesheets since they’re the most prevalent).