To expand just a little on the short paragraph talking about embedded and games. For those interested in these spaces, looking into Immediate Mode GUIs would make for good reading. Rendering the current state of the UI tends to be simpler with lower processing standard deviation than Event driven GUIs. The main tradeoff is that the average processing goes up, since you're redrawing every update. But with embedded it's your worst case that matters most if you have deadlines you can't miss. And in games lower frame rate standard deviation is often a very good tradeoff for lower average frame rate in terms of perceived smoothness.