Your initial baseline was arbitrary. If the game had been 10% slower on Windows, would you have never enjoyed it? If not, how could switching with a 10% penalty be a deal-breaking downside?

Just do it. Swap and let go of objectivity. Let your subjective experience guide you.

For me, the subjective joy of not having to fuck around with Microsoft's bullshit was worth multiples of having to mess around with technical crap to get a game working (spoiler: I nearly never have to do that because I play single player games, Dota and CS). I couldn't give less of a damn if my FPS in some random title is 10% slower than it would be in Windows. So long as it's playable, I benefit in spades from the trade-off.