Doesn't that solely depend on what's running, what you have installed, how much data you have, health of your hard disk, how much RAM you have, what hard disk you have, how much disk space is available..................................................
Your comment was so smug that I realised it would do you a disservice in life if someone didn't respond to your post, so that you wouldn't end up harming yourself with that same smug attitude.
So, to answer your question, yes, it does depend on so many factors.
For any hardware/software configuration -- RAM, processor speed, health of the OS and hardware, storage capacity etc. -- there's often a window of performance that doesn't vary too much, until you start abusing or overloading the system or where the computer gets sick. If you read hundreds and hundreds of posts on Mac forums, the ability to discuss issues is achieved by everyone, without prompting, focusing their discussions on the hypothetical, relatively healthy computer that is not excessively overloaded.
So when someone says, how are you finding Mavericks compared to Mountain Lion, the unspoken assumption is that the other person shares their experiences on a relatively healthy system that is not overloaded to the point of imminent death.
Therefore if I ask how fast is Mavericks' shutdown time, a reasonable person -- and there are un-reasonable people out there -- would answer the question based on a typical healthy install, and not even consider the scenario of a Mac whose HD or SSD was crammed leaving only a few K's of storage space left.
The trick in life is that un-reasonable people, by definition, don't realise that they are un-reasonable.
There's a reason why I am taking such valuable time to explain something so straightforward to you, because I am fearful that that attitude - when carried over to other relational areas in your life - could spell disaster. Maybe there's no one else in your life, except an irritated blogger here, who cares enough for you to point out the elephant in the room. I hope you have a great life, and don't pay too much of a cost-penalty for what might ostensibly be regarded as lost opportunities, but others can see the glaring faults, but didn't want to tell you, lest you be offended.
Anyway, gotta get off the work.