With regards to Magit being slow, are you using it on Windows?
WSL might make things faster.[1] IIUC, the problem is that starting new processes is much slower on Windows than on Linux/Unix and Magit relies heavily on that. This seems to have plagued Git tooling more generally but maybe this got fixed since then.[2]
[1] https://emacs.stackexchange.com/a/58444
[2] https://github.com/magit/magit/issues/2395#issuecomment-1710...