Running Page Speed

Page Speed generates its results based on the state of the page at the time you run the tool. To ensure the most accurate results, you should wait until the page finishes loading before running Page Speed. Otherwise, Page Speed may not be able to fully analyze resources that haven't finished downloading.
Alternatively, enable the Automatically run at onload option to have Page Speed automatically start the analysis after any page is properly loaded. See Advanced options below for details.
To profile a page with Page Speed:

1. Start Firefox.
2. Select Tools > Firebug > Open Firebug.
3. In the Firebug window, select the Page Speed tab.
4. Navigate to the web page you want to analyze. Wait until the Done message appears on the browser status bar and the progress bar disappears. For pages with streaming video, which don't show the Done message, wait until the video begins to play.
   
   
5. Click Analyze Performance. When the page is analyzed, Page Speed displays the list of web performance best practices and the page's score on each one, sorted by importance/priority for this page.
   
   
   
6. Optionally, do any of the following:
• Expand any of the rules to see specific suggestions for improvement.
• Click any of the rule names to see documentation about each rule.
• Click Resources to show a detailed list of resources referenced from this page.
• Select Export > Write JSON File to export the results in JSON format.
• Select Export > Send Scores to www.showslow.com to send results to Show Slow, an open source web-based tool for collecting performance metrics from Page Speed over time. For information on the data that is sent to Show Slow, see the beacon documentation on the Page Speed open source project page for the "minimal beacon".