I moved from OMZ to Prezto for this reason (its a fork of oh my). But prezto is slow too.
The only recourse I think is to go back to a clean zsh and build your own .zshrc. There are other leaner zsh "frameworks"[1] I have read of, but i intend going back to stock zsh soon.
The only recourse I think is to go back to a clean zsh and build your own .zshrc. There are other leaner zsh "frameworks"[1] I have read of, but i intend going back to stock zsh soon.
1) - see zshuery and zsh-m on github.