[fhood]

I don't know if I can agree with you on this. In ~2016 I built a PC (i7, 24GB RAM, 1.5TB ssd, gtx 1080) and my 2014 17 inch mbp has slowly been closing the gap. This is probably more due to software optimizations than hardware, but things just open and close more smoothly and quickly these days on the laptop.

I think the real issue is that Windows hasn't been effectively utilizing the RAM I've given it.

[winkeltripel]

I've found that windows benefits from being reinstalled every once in a while. Try a fresh install of Windows 10, and see where that gets you?

[fhood]

I suspect you are right, but I really, really, don't want to take the time to do that.

[Shikadi]

Windows 10 has a nice feature to "refresh" which supposedly re-installs Windows while keeping programs and settings. I haven't tried it, so no idea how well it works, but it might be worth your time