This article is a bit dated and may have already been posted before, but thought it may be of interest as it shows some of the testing that was done on the catapult solution for an enterprise using 10.8 million accounts, reaching 4,000+ transactions per second (consider that Visa averages around 2,000 tps).
https://www.arara.com/english/entry4943/ Thats huge and once its released, the prize will go up insanely high. Time to start accumulating some more xems.