Download E-books Even Faster Web Sites: Performance Best Practices for Web Developers PDF

By Steve Souders

Functionality is necessary to the good fortune of any site, and but contemporary net functions push browsers to their limits with expanding quantities of wealthy content material and heavy use of Ajax. during this publication, Steve Souders, internet functionality evangelist at Google and previous leader functionality Yahoo!, presents necessary concepts that can assist you optimize your site's functionality.

Souders' earlier ebook, the bestselling High functionality net Sites, surprised the net improvement international through revealing that eighty% of the time it takes for an internet web page to load is at the buyer aspect. In Even speedier internet Sites, Souders and 8 professional individuals offer top 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, growing responsive functions, loading scripts with no blocking off different parts, and more.
  • Network--Learn to proportion assets throughout a number of domain names, decrease photo dimension with out lack of caliber, and use chunked encoding to render pages quicker.
  • Browser--Discover possible choices to iframes, tips to simplify CSS selectors, and different concepts.

Speed is vital for latest wealthy media sites and internet 2.0 purposes. With this publication, you will shave worthwhile seconds off your websites' load occasions and cause them to reply even faster.

This ebook comprises six visitor chapters contributed through Dion Almaer, Doug Crockford, Ben Galbraith, Tony Gentilcore, Dylan Schiemann, Stoyan Stefanov, Nicole Sullivan, and Nicholas C. Zakas.

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1 Trade-offs rules of Optimization Ajax Browser Wow! JavaScript precis 1 1 four four five 6 6 2. developing Responsive internet purposes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 what's speedy adequate? Measuring Latency whilst Latency is going undesirable Threading making sure Responsiveness internet staff Gears Timers results of reminiscence Use on reaction Time digital reminiscence Troubleshooting reminiscence matters precis nine 10 12 12 thirteen 14 14 sixteen 17 18 18 19 three. Splitting the preliminary Payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Kitchen Sink mark downs from Splitting discovering the cut up Undefined Symbols and Race stipulations 21 22 23 24 v Case examine: Google Calendar 25 four. Loading Scripts with out blockading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Scripts Block Making Scripts Play great XHR Eval XHR Injection Script in Iframe Script DOM aspect Script Defer record. write Script Tag Browser Busy symptoms making sure (or averting) Ordered Execution Summarizing the consequences And the Winner Is 27 29 29 31 31 32 32 33 33 35 36 38 five. Coupling Asynchronous Scripts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . forty-one Code instance: menu. js Race stipulations conserving Order Asynchronously approach 1: Hardcoded Callback approach 2: Window Onload strategy three: Timer procedure four: Script Onload process five: Degrading Script Tags a number of exterior Scripts controlled XHR DOM point and document Write normal resolution unmarried Script a number of Scripts Asynchronicity within the genuine international Google Analytics and Dojo YUI Loader application forty two forty four forty five forty six forty seven forty eight forty nine 50 fifty two fifty two fifty six fifty nine fifty nine 60 sixty three sixty three sixty five 6. Positioning Inline Scripts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sixty nine Inline Scripts Block stream Inline Scripts to the ground start up Execution Asynchronously Use Script Defer conserving CSS and JavaScript Order chance: Stylesheet via Inline Script Inline Scripts Aren’t Blocked through such a lot Downloads vi | desk of Contents sixty nine 70 seventy one seventy three seventy three seventy four seventy four Inline Scripts Are Blocked through Stylesheets This Does take place seventy five seventy seven 7. Writing effective JavaScript . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . seventy nine coping with Scope Use neighborhood Variables Scope Chain Augmentation effective information entry circulation keep watch over quickly Conditionals quickly Loops String Optimization String Concatenation Trimming Strings keep away from Long-Running Scripts Yielding utilizing Timers Timer styles for Yielding precis seventy nine eighty one eighty three eighty five 88 89 ninety three ninety nine ninety nine a hundred 102 103 a hundred and five 107 eight. Scaling with Comet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 How Comet Works shipping options Polling lengthy Polling eternally body XHR Streaming destiny Transports Cross-Domain results of Implementation on functions coping with Connections Measuring functionality Protocols precis 109 111 111 112 113 one hundred fifteen 116 116 118 118 119 119 a hundred and twenty nine. Going past Gzipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 Why Does This topic? What reasons This? quickly overview The wrongdoer Examples of renowned Turtle Tappers how you can aid those clients? layout to reduce Uncompressed measurement teach clients 121 123 123 123 124 124 a hundred twenty five 129 desk of Contents | vii Direct Detection of Gzip aid a hundred thirty 10.

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