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Show Slow is an open source tool that helps monitor various website performance metrics over time. It captures the results of YSlow, Page Speed, WebPageTest and dynaTrace AJAX rankings and graphs them, to help you understand how various changes to your site affect its performance.

DEMO is a demonstration site that continuously measures the performance of a few reference web pages. It also allows for public metrics reporting.

Open Source project on Github

Open source project on GitHub:


ShowSlow Installation and configuration

Upgrading existing instance

Automated testing

To have your ShowSlow instance collect data automatically for URLs entered by users, you need to configure your tools and use automation scripts to run them on periodically (using cron, for example).

To get a list of URLs in the instance call page and to get a list of URLs that do not have any data collected yet (for more frequent monitoring), call

Configuring Tools


You can ask questions and discuss ShowSlow in our group and if you have an issue, just open a ticket


You can contribute by:

Editing these pages

If you see some error or typo on this site, just click edit at the top and fix it - it's a wiki

Same goes for documentation omissions or any other useful information about the project.

Development blog

You can track ShowSlow progress in the blog:

Personal tools