dock is a great tool, but it can also be a great pain in the ampersand-dollarsign-dollarsign. It's incredibly easy to
accidentally click an app you're not interested in opening -- forcing you to wait for it to load so you can then close
it out, adding an abundance of unnecessary seconds to your objective.
Well, there's no way to really fix that, but there is a way to salvage some of those seconds: When you accidentally click an app, quickly click-and-hold on the app's dock icon while holding down the Option key. The context menu will pop up, and you can force kill it before it bogs down your system in loading.
Not the best or most efficient method of time-saving, but hey -- it works.