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Client-side performance testing. Jacek Maciejewski QA Engineer. Agenda. What is client-performance? Tools Continuous testing. Client-side performance. simply: time it takes for browser to render a page i nfluenced by: number of assets j avascripts server configuration. What is it?. - PowerPoint PPT Presentation
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© 2011 Cognifide Limited. In commercial confidence only.
Client-side performance testing
Jacek Maciejewski
QA Engineer
© 2011 Cognifide Limited. In commercial confidence only.
• What is client-performance?• Tools• Continuous testing
Agenda
© 2011 Cognifide Limited. In commercial confidence only.© 2011 Cognifide Limited. In commercial confidence only.
Client-side performance
© 2011 Cognifide Limited. In commercial confidence only.
What is it?
• simply: time it takes for browser to render a page
• influenced by:− number of assets− javascripts− server configuration
© 2011 Cognifide Limited. In commercial confidence only.
Why is it important?• influences how a user see a page / brand• 25% of people abandon the page if it does not load
within 4 seconds• every extra secont of loading equals 7% less conversion
rate• Amazon would lose 1.6 billion$ per year if their website
loads 1 second longer• Google would get 8 mln requests less every day if it was
slower by 0.4 second.• Making Barack Obama’s website 60% faster increased
donation conversions 14%• Google’s page rank is partially determined based on
performance
© 2011 Cognifide Limited. In commercial confidence only.© 2011 Cognifide Limited. In commercial confidence only.
Tools
© 2011 Cognifide Limited. In commercial confidence only.
Tools
• Firebug / Developer Tools• Google Page Speed• Yslow• Gtmetrix.com (YSlow and PS together)• Google Speed Tracer• ajaxDynaTrace• WebPageTest.org
• https://developers.google.com/speed/
© 2011 Cognifide Limited. In commercial confidence only.
Tools – browser timings
• window.performance.timing• W3C standard• supported in every modern browser
© 2011 Cognifide Limited. In commercial confidence only.
© 2011 Cognifide Limited. In commercial confidence only.© 2011 Cognifide Limited. In commercial confidence only.
How to automate?
© 2011 Cognifide Limited. In commercial confidence only.
Automation
• Browser Timings are easy to use with Selenium WebDriver
• HAR Logs− From Firebug (Net panel + NetExport plugin)− From BrowserMob (proxy)− https://code.google.com/p/harstorage/
• possible to integrate Google PS with automation frameworks
• WebPageTest – API• performance logs from the newest Chrome Driver
(https://gist.github.com/klepikov/5457750)
