Beyond zprof (
https://www.bigbinary.com/blog/zsh-profiling) not really I'm afraid. I did the majority of my zsh-prompt hacking 10 years ago and haven't thought about it since. That snippet could be from anywhere.
You could peek at something like zprezto https://github.com/sorin-ionescu/prezto or pure https://github.com/sindresorhus/pure for tips.
Fetching git/hg/... info is always slow, so try and speed that up where you can (as to how to do that, uhh... I know my prompt has a dirty-state check nicked from pure for speed reasons). You can also cache any `asdf init zsh` or similar to a file and do the same "run in background" trick so the next shell will have any changes.
The biggest improvement I can remember was dropping zprezto for my own much smaller config, I really did not need much comparatively. Mostly some git info and "good default" options. I use zgenom for a plugin manager but only have 3 plugins, probably I should just dump it and inline the plugins to avoid getting owned one day.
