Measuring web performance
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Things to be aware of when you are measuring the performance of your web sites (both synthetic testing and Real User Monitoring).
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Measuring web performance
- 1. Measuring Web Performance Patrick Meenan pmeenan@webpagetest.org @patmeenan
- 2. Types of Measurement velocityconf.com/velocity2011/public/schedule/detail/18039
- 3. Measuring Web Performance SYNTHETIC TESTING
- 4. Active Testing • Consistent results – Good for detecting and diagnosing issues that are 100% repeatable and on pages you are monitoring • Lots of detail • Availability monitoring • Not representative of actual end-user performance – Usually tested from data centers – Sometimes co-located with CDN provider equipment
- 5. Bandwidth/Latency Impact (Fixed 60ms RTT) (Fixed 5Mbps Bandwidth) 5 www.belshe.com/2010/05/24/more-bandwidth-doesnt-matter-much/
- 6. US Broadband Latency WebPagetest DSL WebPagetest Cable WebPagetest FIOS Backbone 6 www.fcc.gov/document/measuring-broadband-america-report-consumer-broadband-performance-us
- 8. DSL – Back-End: 17% Backbone – Back-End: 52% 8
- 9. Mac Traffic Shaping OS X Lion + Xcode 4.1 Cable, DSL, 3G, Edge, WiFi and Custom GUI for dummynet (which has been available for a while) osxdaily.com/2011/08/10/simulate-internet-connectivity-bandwidth-speeds-network-link-conditioner/
- 10. Synthetic Browsers • Know HOW your active testing is done – Some only test the base page – Synthetic browsers usually not reflective of real browser – Real browser testing – Connectivity (backbone, last-mile) • www.engadget.com – Synthetic Browser: 447 requests – IE 8: 241 requests
- 11. Measuring Web Performance REAL USER MONITORING (RUM)
- 12. Real User Monitoring (RUM) • Full coverage on all pages visited by users • Real performance information for end-user experience • No availability monitoring • No competitive reference • Limited detail – … but getting better
- 13. Navigation Timing window.performance.timing IE 9+ Chrome Firefox 9+ Android 4+ Front-End Back-End 13 dvcs.w3.org/hg/webperf/raw-file/tip/specs/NavigationTiming/Overview.html
- 14. Resource Timing (draft) Timing for every network-loaded resource w3c-test.org/webperf/specs/ResourceTiming/
- 18. Back-End Only
- 19. Access Logs • Overall Response Times - %D (Apache) • Custom variables (app-specific timings) • Logster + graphite = graphs • Lots of data-mining opportunities – Broken links/content (404’s with useful referer information) • Mike Brittain (Etsy) Presentation – http://www.slideshare.net/mikebrittain/web-performance-culture- and-tools-at-etsy-11159635
- 20. Measuring Web Performance THE METRICS
- 21. When is “Done”? Easy answer is onLoad But…
- 22. When is “Done”? Twitter onLoad (2.4s) Twitter end of activity (8.2s)
- 23. 2 Pages, Identical Performance …
- 27. Last Visual Change Identical
- 31. The Speed Index The user experience of A was 7.4 times faster than B sites.google.com/a/webpagetest.org/docs/using-webpagetest/metrics/speed-index
- 33. Amazon.com vs. Twitter …
- 35. Amazon vs. Twitter Amazon Twitter Speed Index 1501 6014 (+300%) onload 2.4 2.4 Fully Loaded 6.4 8.2 (+28%) www.webpagetest.org/video/view.php?id=120414_22f2206da973b41621c499e2be01d555cdac6ab0&bare=1
- 37. Measuring Web Performance WHAT’S NEW IN WEBPAGETEST
- 38. New Waterfall UI Nav Timing – domContentLoaded (Firefox/Chrome) Nav Timing – load event (Firefox/Chrome) Pop-up request details
- 39. Dependencies (Chrome) Line of code that Triggered request
- 40. Response Bodies
- 41. Dev Tools Timeline (Chrome)
- 42. Dev Tools Timeline (Chrome)
- 43. Creating Videos
- 44. Creating Videos (cont) Customize: - End Point/Times - Specific Run - First/Repeat View - Labels www.webpagetest.org/video/compare.php?tests=120416_QX_3ZKFP%2C120416_DR_3ZKFJ&bare=1
- 47. Custom viewport size Chrome/Firefox
- 48. EC2 AMIs IE 7 m1.small or IE 8 c1.medium IE 9, Chrome, Firefox (single image)
- 49. News/Updates • Twitter: @patmeenan • Google+ PatMeenan@gmail.com WebPagetest • WebPagetest Forums http://www.webpagetest.org/forums/