I'm not sure what the conclusion of your statement is, but Safari is still head and shoulders faster than both Chrome and Firefox on macOS. Both on macOS 11.4 a

I'm not sure what the conclusion of your statement is, but Safari is still head and shoulders faster than both Chrome and Firefox on macOS. Both on macOS 11.4 and Safari 14.1.1, and macOS 12 and Safari 15. Safari never got slower. Chrome got embarrassed into effectively cleaning up its act a bit and managing the catastrophic memory usage, but it's still slower and less efficient. And it's still a memory disaster compared to its contemporaries.