I'm extended events are lovely, but I'm a dinosaur and would use Profiler tracing for this..specifying filters for the databaseID, and whatever else you can narrow it by.   Turn off trace items you don't need, such as login audits, connections, etc.

This is what I do when I get told "the app is slow, tune it" and I had no hand in developing the app.

Plenty of places to learn more about tracing all over the web that can do a better job than I can here 🙂

Good luck!