Linux on an SSD is fast. Android is fast. I don't see much slowness. Windows has a bit here and there but in general things are pretty snappy, it's not like the tail end of the HDD era where stuff really was slow.
My Linux distro has never slowed down for me, except where I've personally done some weird config muckup. And I know exactly who is to blame... insert "of course I know him, he's me" meme here...