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

By Steve Souders

Functionality is necessary to the good fortune of any site, 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 ebook, Steve Souders, internet functionality evangelist at Google and previous leader functionality Yahoo!, offers precious thoughts that can assist you optimize your site's performance.

Souders' earlier booklet, the bestselling excessive functionality sites, stunned the net improvement international through revealing that eighty% of the time it takes for an internet web page to load is at the consumer facet. In Even quicker websites, Souders and 8 professional members supply top practices and pragmatic suggestion for bettering your site's functionality in 3 serious categories:
# JavaScript-Get recommendation for realizing Ajax functionality, writing effective JavaScript, growing responsive purposes, loading scripts with out blockading different parts, and more.
# Network-Learn to percentage assets throughout a number of domain names, lessen photograph dimension with out lack of caliber, and use chunked encoding to render pages faster.
# Browser-Discover possible choices to iframes, tips on how to 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 the best way to shave worthwhile seconds off your sites' load instances and cause them to reply even swifter.

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Extra resources for Even Faster Web Sites: Performance Best Practices for Web Developers

Example text

Most modern computers have multiple “cores,” which means that they have the ability to execute multiple threads in a truly concurrent fashion (whereas previous computers have only emulated concurrency through fast task switching). Implementing task switching manually via JavaScript as we’ve done in the listing can’t take advantage of such architectures; you are therefore leaving processing power on the table by forcing one of the cores to do all of the processing. Thus, it is possible to perform long-running operations on the browser’s main thread and maintain a responsive interface, but it’s easier and more efficient to use workers.

Anything slower than 10 seconds needs a percent-done indicator as well as a clearly signposted way for the user to interrupt the operation. Assume that users will need to reorient themselves when they return to the UI after a delay of more than 10 seconds. Delays of longer than 10 seconds are only acceptable during natural breaks in the user’s work, for example when switching tasks. 1 seconds to execute, your page won’t have that slick, snappy feel; if it takes longer than 1 second, the application feels sluggish; longer than 10 seconds, and the user will be extremely frustrated.

Ideally, this would also be the response time for sorting the column—if so, users would feel that they are sorting the table. 1 second: Limit for users feeling that they are freely navigating the command space without having to unduly wait for the computer. html What Is Fast Enough? | 9 opposed to having the command be a direct effect of the users’ actions. 1 seconds, it certainly has to be done in 1 second, or users will feel that the UI is sluggish and will lose the sense of “flow” in performing their task.

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