Download PDF by Steve Souders: Even Faster Web Sites: Performance Best Practices for Web

By Steve Souders

ISBN-10: 0596522304

ISBN-13: 9780596522308

Functionality is necessary to the luck of any website, and but today's net functions push browsers to their limits with expanding quantities of wealthy content material and heavy use of Ajax. during this e-book, Steve Souders, net functionality evangelist at Google and previous leader functionality Yahoo!, presents useful recommendations that will help you optimize your site's performance.

Souders' earlier publication, the bestselling excessive functionality websites, surprised the internet improvement international by way of revealing that eighty% of the time it takes for an internet web page to load is at the shopper facet. In Even quicker websites, Souders and 8 specialist members offer most sensible practices and pragmatic recommendation for making improvements to your site's functionality in 3 severe categories:
# JavaScript-Get recommendation for knowing Ajax functionality, writing effective JavaScript, developing responsive functions, loading scripts with no blocking off different parts, and more.
# Network-Learn to percentage assets throughout a number of domain names, lessen snapshot dimension with out lack of caliber, and use chunked encoding to render pages faster.
# Browser-Discover possible choices to iframes, how you can simplify CSS selectors, and different techniques.

Speed is key for today's wealthy media websites and internet 2.0 purposes. With this ebook, you'll easy methods to shave priceless seconds off your sites' load occasions and lead them to reply even speedier.

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Ex=10010&title=Script+Dom+Element Script Defer Internet Explorer supports the SCRIPT DEFER attribute as a way for developers to tell the browser that the script does not need to be loaded immediately. write and no other scripts in 32 | Chapter 4: Loading Scripts Without Blocking the page depend on it. When Internet Explorer downloads the deferred script, it allows other downloads to be done in parallel. js'> Although DEFER is part of the HTML 4 specification, it is implemented only in Internet Explorer and in some newer browsers.

Given Brendan’s influence in the industry and on the future of JavaScript (which is considerable), and the broad degree to which this position is shared, it is safe to say that threads will not be coming to JavaScript anytime soon. However, there are alternatives. The basic problem with threads is that different threads can have access to and modify the same variables. This causes all sorts of problems when Thread A modifies variables that Thread B is actively modifying, and so on. You might think these sorts of issues could be kept straight by decent programmers, but it turns out that, as Brendan said, even the best of us make pretty horrible mistakes in this department.

Doing so engages the user and creates a responsive experience for her. Imagine if the Facebook JavaScript could be split into two parts: what’s needed to render the initial page, and everything else. Rather than bog down the user’s first impression with “everything else,” the initial JavaScript download should include only what’s necessary for the initial rendering. The remaining JavaScript payload can be loaded later. * Fourteen scripts are downloaded when logged-in users visit this page. If the user is not logged in, fewer scripts are used.

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Even Faster Web Sites: Performance Best Practices for Web Developers by Steve Souders

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