Google’s Page Speed testing tool, which recently went from a browser add-on to a web-based tool, now sports a new API. The Page Speed Online API allows outside applications to send URLs to Page Speed and get back a list of things the site developer can do to speed up the page in question.

If you’d like to try it, head over to the new documentation page and request an API key. Sample apps include using the Page Speed Online API to display suggestions for speeding up sites or even combining the API with the Google Charts API to show a visual breakdown of the page’s resources.

For a more practical example of how the Page Speed Online API can help out your site, check out the latest version of the W3 Total Cache plugin for WordPress. If you’re not already using W3 Total Cache in your WordPress installation, we highly recommend you install it, especially now that the plugin taps into the Page Speed API. W3 Total Cache now sends your pages to the Page Speed Online API and then offers Page Speed suggestions, right in the WordPress dashboard.