Real User Monitoring gives insight into performance for actual users visiting the website.
https://www.pingdom.com/rum/
Analytics and Tracking · Application Performance
Get access to data on 287,555 websites that are Pingdom RUM Customers. We know of 19,165 live websites using Pingdom RUM and an additional 268,390 sites that used Pingdom RUM historically and 9,588 websites in the United States.
Get a list of 287,555 websites using Pingdom RUM which includes location information, hosting data, contact details, 19,165 currently live websites and an additional 133,220 domains that redirect to sites in this list. 268,390 sites that used this technology previouslyand 9,588 websites in the United States currently using Pingdom RUM.
Countries
Financial
Group
Region
These are sites that we think might use Pingdom RUM in the future because of their similarity to other sites that already do.