I have a pretty new 2019 MacBook Pro and hardly anything saved on it, as far as memory goes, etc. Big Sur has SLOWED down my mabook pro A LOT ! While I like some of the features, like better iMessage, and mirroring iPhone stuff a bit more, i.e. control center, my safari runs AWFUL ever since I downloaded Big Sur and sometimes there are significant freezes in all functions of computer. So far, this is VERY dissatisfactory and also frustrating. I mean, my computer is relatively new.