The "list" command is slow

If you run gush with no arguments, then list of available commands is shown. Problem is that it takes 2 seconds to show it.

I wonder where these 2 seconds go, knowing that Symfony Console component isn't that slow.

I'm suspecting that some of the commands do their initialization (e.g. connecting to GitHub) in wrong place (e.g. in constructor) instead of dedicated method of `Command` class.