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 289,131 websites that are Pingdom RUM Customers. We know of 20,004 live websites using Pingdom RUM and an additional 269,127 sites that used Pingdom RUM historically and 10,222 websites in the United States.
Get a list of 289,131 websites using Pingdom RUM which includes location information, hosting data, contact details, 20,004 currently live websites and an additional 137,347 domains that redirect to sites in this list. 269,127 sites that used this technology previouslyand 10,222 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.