Yes. I have a M1 8GB MacBook Air that I use as a lightweight travel machine, and macOS 26 utterly trashed the performance on it. Things I used to do fine (work on small Xcode projects) were completely unusable, to the point where I had to downgrade it to Sequoia.
I've been running it on the macOS 27 beta all summer, and it's night and day. It's usable again.
I've been running it on the macOS 27 beta all summer, and it's night and day. It's usable again.