DNS and Connect timings

[gnublin]

Hello,

Do you have an option to get DNS and Connect time ? (like performance.timing value)

Regards,
Gnublin.

[macbre]

@gnublin, phantomas does not provide this information at the moment. We're blocked on ariya/phantomjs#10245

[macbre]

SlimerJS and PhantomJS 2.0 support Resource Timing API which exposes information such as connection and DNS lookup times.

[macbre]

Introduce performanceTiming module with the following metrics:

• performanceTimingConnect
• performanceTimingDNS
• performanceTimingPageLoad
• performanceTimingTTFB

// Navigation Timing
var t = performance.timing,
    pageloadtime = t.loadEventStart - t.navigationStart,
    dns = t.domainLookupEnd - t.domainLookupStart,
    tcp = t.connectEnd - t.connectStart,
    ttfb = t.responseStart - t.navigationStart;

http://www.stevesouders.com/blog/2014/08/21/resource-timing-practical-tips/

[macbre]

Implemented (see #567), however I get strange results in both SlimerJS and PhantomJS 2.0. Times for DNS and HTTP connection are always zero and page load time is pretty small compared to the values of the other metrics.

$ ./bin/phantomas.js http://www.example.com --modules windowPerformance --verbose --gecko

10:16:16.149 performanceTiming: data {"navigationStart":1445163374274,"unloadEventStart":0,"unloadEventEnd":0,"redirectStart":0,"redirectEnd":0,"fetchStart":1445163374274,"domainLookupStart":1445163374274,"domainLookupEnd":1445163374274,"connectStart":1445163374274,"connectEnd":1445163374274,"requestStart":1445163374274,"responseStart":1445163374274,"responseEnd":1445163374274,"domLoading":1445163374304,"domInteractive":1445163374308,"domContentLoadedEventStart":1445163374312,"domContentLoadedEventEnd":1445163374312,"domComplete":1445163374313,"loadEventStart":1445163374313,"loadEventEnd":1445163374313}

* timeToFirstByte: 280 ms
* timeToLastByte: 283 ms
* domInteractive: 38 ms
* domContentLoaded: 35 ms
* domContentLoadedEnd: 54 ms
* domComplete: 59 ms
* timeBackend: 83 %
* timeFrontend: 17 %
* performanceTimingConnect: 0 ms
* performanceTimingDNS: 0 ms
* performanceTimingPageLoad: 39 ms
* performanceTimingTTFB: 0 ms