It would help if we could get to specific examples – e.g., a specific step in registration that is slow in real world settings. If we can replicate the slowness in demo environments, then we can set a specific performance target to hit. If we are unable to replicate the performance issue in our demo environments, then maybe we need to generate sufficient demo data to simulate the real world problem.
For example, @grace’s post on fetching locations, which led to realizing we needed to index locations and then to newer Tomcat performance issues.
For issues that turn out to be related specifically to moving too much data, I’d suggest we handle those under the topic of bandwidth usage.