This issue is more obvious on windows where process creation is very slow. Emacs 26.1 should perform much better at process creation as it uses vfork on macOS

This issue is more obvious on windows where process creation is very slow. Emacs 26.1 should perform much better at process creation as it uses vfork on macOS instead of fork. I don’t think that caching is an easy solution. Git can do a lot of weird things so heuristics are bound to be unreliable, brittle, or both. Furthermore the wins from caching are small for the typical users who use systems that are capable of starting processes in good time.