Have the same question...
I have noticed over the years that after a few OS versions from launch date of a new Mac, performance seems to take a hit.
For example: Final Cut Pro. When rendering and exporting, when a new Mac comes out..all CPU and GPU are at almost full blast (or close) and exporting and rendering are fast (selling point to buy). Then...gradually as newer updated Macs come out...mysteriously the once fast rendering and exporting start to slow down; Not firing all of the CPU or GPU's after a few years of "newer" macOS's, especially after firmware updates.
It seems clock work that it starts to occur after three years and then by five years, my once "new' fast Mac seems slower...thus...needing to buy a new one.. I am not a conspiracy person that Apple does this on purpose, but I have noticed this over the last 10 years and have questioned it...
macOS Sequoia in beta seems to run fast and quicker (some) compared to Sonoma (I tried it on my M2 MacBook Air), but has anyone seen any advantages yet or slowdowns on M1 Pro or M1 MacBook Pros? Much appreciated if some have dived into the betas (especially firmware updates) that can help us out as we look forward in making buying decisions coming late fall.