This is an avalanche of wisdom. I'm summoning the courage to enable "Show GPU Overdraw" on my apps and seeing just how bad it is.

And if anyone else was interested, the developer of Falcon Pro has already started implementing the fixes. To quote him from Twitter (@joenrv): "Reading @romainguy analysis of my app makes me feel a bit like a naked dude in a room full of people staring xD #letsgettowork"