The speed you perceive of anything before your eyes is often based on your beliefs, reactions, expectations, training, etc. One person may say Windows is super fast compared to Yosemite and another person may notice no difference at all.
Back when OSX 10.1 and XP came out these debates were settled objectively with evidence instead of subjective perceptions which can easily deceive you as an OS user. For example, we had an app that would create 1000 empty Windows and then close them. We used that to benchmark how fast each OS could draw window elements. It's one test, more could be created for testing window switching, virtual desktop switching, etc.
With Windows 10 Microsoft animates its Windows very differently to OSX. The former fades windows in and out. The latter performs a full animated scale (or genie if you wish). These animations could have no significant speed difference in real world terms, but Windows' method could trick you to believe it is much faster.
Without imperical evidence like that you're all debating which falls to the ground faster - a ball of paper or a cannonball? How the mind perceives things is highly deceptive. In the words of Richard Feynman 'The first principle is that you must not fool yourself and you are the easiest person to fool.'
