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The APDEX Performance Score

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  • OutSystems uses the APDEX (Application Performance Index) metric, to measure the user satisfaction with the performance of your applications.

    How to Interpret an APDEX Score

    Your applications are rated from 0% to 100%:

    • 0%–70%: the application provides a poor user experience for being slow
    • 70%–85%: the application provides a fair user experience for being fairly slow
    • 85%–100%: the application provides a good user experience, since it's fast

    If there is no data about an application, OutSystems displays a hyphen (-).

    How an APDEX Score is Calculated

    Each time the end user navigates to a page in your application, OutSystems checks how long the page took to load. If the page loads in:

    • More than 8 seconds: it provides a poor user experience, because it's slow
    • 2–8 seconds: it provides a fair user experience, because it's fairly slow
    • Less than 2 seconds: it provides a good user experience, because it's fast

    To calculate the APDEX score of an application, we use the following formula:

    This scores an application with:

    • 0% if all page loads were slow, i.e. took more than 8 seconds
    • 50% if all page loads were fairly slow, i.e. took between 2 and 8 seconds
    • 100% if all page loads were fast, i.e. took less than 2 seconds

    You can learn more about this industry standard at