Profiling

In classic Android with views, you knew that you were going to measure twice if you ever used anything like relatively out. And then if you had nested relatives, it was going to take forever. But now it sounds like well it kind of depends on what you've put in there. What is an easy way if someone suspects that they have a performance problem because at layout time because of some of these complexities, how do they find that information? Profiling. Right, but is there a particular thing that would tell them, oh I see we're doing a double measure or we're compounding that by double measures all the way down.