I am glad to see queries coming from developers as they start to develop complex applications using the Unity Connection API.
There are questions when using the notifications about the scale of the new applications being developed.
The developer should plan on doing a scale test to determine the final numbers. The various components that build the solution can provide their numbers, but combining them together can lead to situations which were not clear earlier.
On this page here we have posted what the performance tests on Unity Connection has determined - docwiki page about scale