Troubleshooting Tips?

Over the past few days I’ve made a number of changes to my app, most of which I didn’t document in any meaningful way (other than “fix x”). Yesterday I noticed that when clicking on an item to launch the detail screen popup, it now is very slow in displaying the popup window, almost like it has some fade-in effect applied to it.

Any tips on how to troubleshoot this? I.e. likely causes for that particular action being very slow?

Is it just a “show details screen” action or do you run any thing else in that action to launch the detail screen?

How complex is the calculation for everything involved in that details screen?