We used SpeedCurve to track the performance of the new Guardian responsive site which now loads four times faster and is one of the fastest news sites in the US.
Patrick Hamann - The Guardian
I love @SpeedCurve for correlating RUM data to business metrics. They have some out of the box stuff around bounce rate, and it's easy to add custom business metrics to graph and track.
We used @SpeedCurve to track WebPageTest and RUM results over time. We convinced a client to turn Adobe Tag Manager off for two weeks to see what happened. Load times went through the floor!