The loading bar that I implemented in our app at work is real. It only advances when it has done something, and it advanced that % of the total when it has done it.

It gets away with that because unlikely other bars mentioned here, what’s it’s doing is a lot of little things that all take about the same time, and so it’s actually a pretty decent approximation of how much is done.

So there’s at least one that isn’t fake. ;)