Filming went well today, and we have some amazing lab episodes to show for it. (and thanks fcpsolaradmin for mentioning it!)
While I can't disagree with all the talk about AppInsight, I have to point out two other things:
- This is EXACTLY the question that DPI and Quality of Experience dashboard in NPM 11 was meant to resolve. You can either deploy a sensor on a windows box connected to a span port on a switch between the users and the server, or on the server itself, but either way you should identify definitively whether the problem is application or network based.
- Database Performance Analyzer will also go a long way to nailing down this issue. Think of it as AppInsight on steroids.
Both of those are solid tools to give you a clear answer quickly.
Beyond that, all the advice above is sound, albeit it will involve a bit more guesswork.