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Measuring Page Performance

This page provides an overview of tools and techniques for measuring page in Launchpad.

The Ultimate Measure: Time To Interact

We evaluate our performance in terms of Time to Interact, or TTI. This value is the soonest that a person can use a Launchpad page.

TTI has three components: network time, spent on the wire; generative time, spent on the server; and render time, spent in the browser. This is the approach used by Facebook when they optimize their pages.

There are some factors that have a major effect on Time To Interact for an individual user:

• Geographic location: China vs. England
• Browser: Firefox, Chrome or IE
• Anonymous browsing vs. Authenticated (logged in) browsing
• First time visitors vs. repeat visitors

Tools for Measuring Performance

• anchor:PySlow

• webpagetest.org

• anchor:Wireshark

• zc.servertracelog
• pingdom

PySlow

• http://launchpad.net/pyslow

PySlow is a tool for automated collection and recording of YSlow test results. We have gathered the YSlow scores for the key launchpad pages together in one report:

• http://people.canonical.com/~mars/metrics/pyslow/lpnet-key-pages/

webpagetest.org

Wireshark