Hi!
A thing I was wondering about while testing LDF is how this type of service might behave under load. In the tests I am doing, my single browser issues several 100,000 requests for a single query, at an average rate close to 100 requests per second. This is one user.
So I did some light benchmarking, and it looks like a single server can do 700 to 800 rps for TPF queries without significant rise in the load (which is understandable since it's almost all IO). Single request median time seems to be around 150ms and 99% time around 500ms. This quick test was done on 150 parallel threads.