Prompt for speeding up terminal start-up time

gistfile1.txt

My terminal feels slow to open. Audit my ~/.zshrc and make it start faster.

1. Measure first: time `zsh -i -c exit` a few times, then time each slow-looking
   piece on its own (version managers like nvm/rbenv/pyenv/conda, `eval "$(... init)"`
   lines, compinit, plugin frameworks, hooks that run on every `cd` or prompt).
   Show me a table of what costs what before changing anything.
2. Suggest fixes ranked by time saved, e.g. swapping slow tools for fast drop-ins
   (nvm → fnm, pyenv → uv), lazy-loading, caching completions, and removing dead or
   duplicate lines. Point out anything risky, like secrets stored in plain text.
3. Before editing, back up the file next to the original with a timestamp in the name.
4. If you replace a version manager, check which versions my projects actually pin
   (.nvmrc, .node-version, .ruby-version, etc.) and any global packages I installed,
   and reinstall only those so nothing breaks.
5. Afterwards, measure again and check that everything still works: the right versions
   load in each project, my prompt looks the same, and my aliases work.
   Give me a before/after summary and the command to undo it.