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CLIENT-SIDE PERFORMANCE TESTING Anand Bagmar Test Practice Lead
@BagmarAnand about.me/anand.bagmar
ABOUT ME
WHAT DO YOU EXPECT FROM THIS SESSION?
What is
Performance Testing?
What is
Performance Engineering?
TYPICAL ARCHITECTURE
Lets draw!
Caching!
In computing, a cache (/ˈkæʃ/ KASH) is a component that stores data so future requests for that data can be served faster; the data stored in a cache might be the results of an earlier computation, or
the duplicates of data stored elsewhere.
Where can caching be done?
TYPICAL ARCHITECTURE
Improve user experience Reduce server load
WE WILL FOCUS ON
Improve user experience Reduce server load
Measuring Client-side Performance
MEASURING CLIENT SIDE PERFORMANCE
Synthetic Monitoring (& Testing)
Ø WebPageTest.org
Ø SiteSpeed.io
Ø ShowSlow
Ø Google PageSpeed
MEASURING CLIENT SIDE PERFORMANCE
Real User Monitoring
Ø Akamai RUM
Ø Monitis RUM
Ø Google Analytics
WebPageTest.org
WEBPAGETEST – HOSTED SOLUTION
Advantages
Ø Free to use
Ø Global spread
Ø Caters to current web development practices / approaches (responsive / lazy loading / etc.)
Lets Play!
IMPORTANT METRICS
What to Measure?
WebPageTest Metric
Explanation
First reaction
Time to First Byte (TTFB)
Time from the start of the initial navigation until the first byte of the base page is received by the browser (after following redirects).
Content appears
Time to Start Render
Time from the start of the initial navigation until the first non-white content is painted to the browser display.
Page processing completed
DOM Content Ready End
The point when the HTML parser has reached the end of the document which means it has executed any blocking scripts. The CSSOM may not be complete yet.
Full page loaded
Doc Complete Time
The onload event which fires when all of the scripts, css and images defined in the HTML have finished loading (including below-the-fold content).
Refer to WebPageTest documentation for more details: • https://sites.google.com/a/webpagetest.org/docs/using-webpagetest/metrics • https://sites.google.com/a/webpagetest.org/docs/advanced-features/raw-test-results
WEBPAGETEST – HOSTED SOLUTION
Disadvantages
Ø Need to get in the queue of currently executing tests
Ø Can run only against publically available URLs / pages
Ø Limited automation using REST APIs
WEBPAGETEST – PRIVATE INSTANCE
Advantages
Ø Free to use, Open-source
Ø Can run multiple scenarios in parallel (limited by number of agents configured)
Ø Can run against public and private available URLs / pages
Ø Results available for as long as configured
Ø There is no limit on number of tests run per day
WEBPAGETEST – PRIVATE INSTANCE
Disadvantages
Ø Need to setup the WPT server and WPT agents in our own infrastructure, or in AWS
WEBPAGETEST - AUTOMATION
Ø REST API calls
Ø Poll for results / implement call back
Ø Parse summary / detail CSV file to do assertions / validations
Challenges
Ø Managing infrastructure
Ø Polling for results can be time consuming and error prone
YSlow
YSLOW
Advantages
Ø Simple to use (with phantomJS)
Ø Gives reasonably decent information
Ø Easy to hook with Continuous Integration (CI) Server
Lets Play!
YSLOW
Disadvantages
Ø OLD
Ø Does not consider lazy loading / responsive design
Google’s PageSpeed Score
Lets Play!
GOOGLE PAGE SPEED
Ø De facto standard
Ø Shows opportunities to increase page speed score
Ø Works only for public URLs / pages
RESOURCES
Ø www.webpagetest.org
Ø Page Speed
Ø PhantomJS – YSlow
Ø Sample automation –client-side-perf-tests
