Measuring UX and system performance?

We would like to start measuring the performance of Appian from a user perspective.  We currently use NewRelic to do this on our public facing web applications.  We use a combination of Apdex and Avg / 95th percentile page load times.

 

If anyone has any experience with monitoring and measuring the end user performance please would you point me in the right direction.

 

many thanks. 

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