Multi-Minute Startup?

It takes zsh multiple minutes (around 3) to start up on a new server I
just got access to. I have no custom .z* files at this point, so all
that's running should be the /etc files, of which only /etc/zshenv and
/etc/zshrc are actually present. Any ideas what's likely to be slowing
me down so much?
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Aaron Davies
aaron.davies <at> gmail.com