Lag shutting down Mac if don't quit Parallels (10.1.1) first

PROBLEM/QUESTION: If I quit Parallels first, it takes about 3-4 secs to shutdown my Mac. If I don't quit Parallels first, it takes about 45 secs to shutdown my computer (even if I've shut down the Windows 7 VM). Is this normal? Shouldn't my Macbook Pro automatically quit Parallels before shutting down and do it as quickly as if I do it manually?
I'm running Parallels 10.1.1 with a Windows 7 64x VM from Boot Camp partition on a 2011 MacbookPro.

Thanks!

BAT