Google 提高web访问速度[fluent perfcourse].pdf

谷歌官方讲解PPT，提高web访问速度[fluent-perfcourse].pdfThanks. Questions?Twitter @igrigorikG+ gplus to/igrigorikWebigvita.com2)Critical rendering path: resource loadingHTMLDOMRenderNetworkJavaScriptPaintTreeLayoutCSSCSSOMLatencybandwidth3G/4G/3)In-app performance: CPU+ Render@grigoriWhat's the impact of slow sites?Lower conversions and engagement, higher bounce ratesbing server delays experiment50ms200ms03%04%5002000 ms delay500ms06%-12%-10%09%1200reduced per user1ooms0.7%09%28%-1.9%-16%1900revenue by 4. 3%6!2000ms-18%|21%|-43%|44%|38%3100Means no statistically significant changeStrong negative impactsRoughly linear changes with increasing delayTime to Click changed by roughly double the delayPerformance Related Changes and their User ImpactImpact of 1-second delayooA I SECOND7%11%16%IN PAGELOSS IN CONVERSIONSFEWER PAGE VIEWSDECREASEOAD TIMEIN CUSTOMER SATISFACTIONIN DOLLAR TERMSthis means that if your site typically earns $100,000 a day, this yearyou could lse $2.5 MILLION i slescEstrangeloopwww.strangeloopnetworks.comImpact of 1-second delay- StrangeloopHow speed affects bounce ratey0.6517×+33.682R2=0.9|103Bounce rate55351.02.03.04.05.06.07.08.09.010.011.012.013.014.015.016.017.018.019.020.021.022.023.024.025026.027.028.029.030.0Seconds to load first pError pages-- Bounce Rate VisitorsYo hoho and a few billion pages of RUM@grigoriSite speed is a signal for searchGoogle Webmaster Central BlogOfficial news on crawling and indexing sites for the google indexWe encourage you to startlooking at your site's speednot only to improve yourUsing site speed in web search rankingSearch xranking in search engines,Friday, April 09, 2010 at 11: 00 AMWebmaster level: allArchivbut also to improveYou may have heard that here at Google were obsessed with speed, in our products and on the 6 site Feedeveryones experence onsite speed. Site speed reflects how quickly a website responds to web requestsGooglethe internetSpeeding up websites is important-not just to site owners, but to all Internet users Fastersites create happy users and we've seen in our internal studies that when a site responds slowly,visitors spend less time there. But faster sites dont just improve user experience: recent dataGoogle Search Quality Teamhows that improving site speed also reduces operating costs. Like us, our users place a lot of 3value in speed -that's why we've decided to take site speed into account in our searchSelect lWrankings. We use a variety of sources to determine the speed of a site relative to other sites.If you are a site owner, webmaster or a web author, here are some free tools that you can use to Useful linksevaluate the speed of your siteGoogle Webmaster CentralPage Speed, an open source Firefox / Firebug add-on that evaluates the performance ofWebmaster Help Centerweb pages and gives suggestions for improvement.Google Webmaster ToolsUsing site speed in web search ranking@grigoriSpeed is a feature