I have a Mac Book Pro 2019. Fully maxed out. 2.4 GHz 8-Core Intel Core i9. SSD 2TB. Since Big Sur update there is a delay on EVERYTHING. Safari slower, Internet slower, programs slower, everything. I wish I wouldn't have updated it. I did many tips I found online and Clean My Mac software, nothing worked. Please resolve asap. Sad part is I love the new photos for desktop...ha what a lame trade off:-)