scarsman / pageloadtimer

Automated Page Load Timer (Web Navigation Timing)

pageloadtimer

Automated Page Load Timer - Web Navigation Timing (PerformanceTiming Interface)

• Author: Corey Goldberg, 2015
• License: MIT
• Development: https://github.com/cgoldberg/pageloadtimer

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About:

pageloadtimer is a Python program for timing automated browser page loads. It uses Selenium WebDriver to drive a browser, and gathers metrics from the Navigation Timing API's PerformanceTiming Interface. This allows you to measure performance for different phases of loading a web page in a Browser.

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Requirements:

• Python Version:
  • Python 2.7+ or Python 3.3+
• System Dependencies:
  • Firefox (web browser)
  • Xvfb (virtual display server)
• Python Requirements:
  • selenium
  • xvfbwrapper

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Installation from GitHub repo

1. install system requirements (Debian/Ubuntu):

   $ sudo apt-get install -y firefox git python-virtualenv xvfb
   

2. clone the pageloadtimer repo:

   $ git clone https://github.com/cgoldberg/pageloadtimer.git
   $ cd pageloadtimer
   

3. create and activate a virtualenv:

   $ virtualenv env
   $ source env/bin/activate
   

4. install pageloadtimer and requirements:

   $ pip install -e .
   

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Usage

• load a page and get timing info:

  $ python pageloadtimer.py http://example.com
  

• load a page and get timing info, with the browser running headless (Xvfb).:

  $ python pageloadtimer.py -x http://example.com
  

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Example

$ python pageloadtimer.py -x www.example.com
starting browser.
loading page.
quitting browser.


navigation event timings:
*************************
navigationStart: 0ms
fetchStart: 2ms
domainLookupStart: 2ms
domainLookupEnd: 2ms
connectStart: 2ms
connectEnd: 2ms
requestStart: 113ms
responseStart: 154ms
responseEnd: 155ms
domLoading: 154ms
domInteractive: 173ms
domContentLoadedEventStart: 173ms
domContentLoadedEventEnd: 173ms
domComplete: 181ms
loadEventStart: 181ms
loadEventEnd: 181ms

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Further Reading:

• Navigation Timing API: W3C Recommendation
• Navigation Timing API: Mozilla Developer Network
• Selenium WebDriver: PyPI

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Browser Processing Model: