A fair question, but both SSDs so it's definitely not that. Since we're on hardware differences though the Macbook Pro is 3 years old and has a quad-core i7, whereas the Windows 10 laptop is 1 year old and has a dual-core i7. I'm not in love with having only dual cores but I don't think that's the issue either.
its not about opening the profile its about getting to enter your password from a locked screen - i love my w10 machine and its quite snappy when logged in but every unlock has this half-second or so lag until it lets me enter my password - i suspect the animation of the appearing login-form but who knows...