For example, I can see a lot of dropped frames when opening the app drawer or while accessing the notifications bar. (sammobile.com)
I'm still not sure if that's more or less useful than just opening the app drawer and opening the calculator — but then again I don't use it all that much. (androidheadlines.com)
Just open the app drawer and long press on an app icon (this also works on the home screen). (androidauthority.com)