Web Performance: in terms Web Latency, ATF and Rendering Time

Measures the rendeirng time a website in a browser window.

Requirements

• jre 1.8
• chrome browser and chromedriver (it can work with other browser, with some workaround).
• ImageMagic
• FFMpeg

** Install in the docker container using the docker script.

Name

WebLAR files/src contains java source files for recording screen based on selenium framework.

How to calculate the metrics

• dom = t.domContentLoadedEventEnd - t.navigationStart;
• tcpConct = t.connectEnd - t.connectStart;
• dnsLookup = t.domainLookupEnd - t.domainLookupStart;
• ttfb = t.responseStart - t.navigationStart;
• pltStart = t.loadEventStart - t.navigationStart;
• pltUserTime = t.loadEventEnd - t.navigationStart;
• requestTime = t.responseEnd - t.requestStart;
• fetchTime = t.responseEnd -t.fetchStart;
• serverResponseTime = t.responseStart - t.requestStart;

Source: Akamai web performance blog

Known Issues

The experiment may fails because of 'Time out error that may occur while loading the pages'. The problem looks a bug with chromedriver/selenium, but this doesn't affect the result of the experiment.

The issue has been reported by other users as well in stackoverfllow