I tried Spacemacs and was fairly happy other than the performance. Scrolling and even auto-indent were visibility slowing down my typing. It depended on the language but Rust, which is probably my most common language, was distinctly bad.
The performance lag of Spacemacs was addressed by Doom Emacs ( https://github.com/hlissner/doom-emacs ). Have you tried Doom Emacs by any chance. After syncing everything, the performance is stellar in my opinion.