What do the colored bubbles mean in hierarchy viewer?

Question

I am guessing they are a quick overview of the time it took to draw the view, but I am not positive.

Answer 1

they are an indication of the time it took to (from left to right) measure, layout and draw; green being good, red being bad. In measuring and layout red blobs usually occur when the hierarchy is very deep, or you have a lot of views in general (say more than 100ish).