[obviator]

"Check the timing of transitions between visible elements."

I think this comment is even more valuable than the rest of the article. Coding tips are helpful, but most of these can be figured out pretty quickly by a decent programmer. The timing / UI lag issue is something that I see a lot with Android apps, but not so much on iOS. As an Android developer it's important to consider these little details, and be aware that not everybody on the market will have a phone as powerful as yours ;)