If you're using Win7, it's not taking full advantage of your SSD to boot fast. Win8/10 will boot much faster.
I suspect configuration (software and hardware) has a massive impact which is being glossed over.
I have a corporate mac that's sluggish due to mcafee chewing 100% CPU for 5 minute intervals, anything with "enterprise" management software on it is going to suck regardless of OS.
IT closed the users ticket without action: As long as it boots in 15 minutes or less, there is no performance problem.