How to: Weird things happen after typing `source ~/.zshrc`
It's almost always a bad idea to run `source ~/.zshrc`, whether you are using Powerlevel10k or not.
This command may result in random errors, misbehaving code and progressive slowdown of Zsh.

If you've made changes to `~/.zshrc` or to files sourced by it, restart Zsh to apply them. The most
reliable way to do this is to type `exit` and then start a new Zsh session. You can also use
`exec zsh`. While not exactly equivalent to complete Zsh restart, this command is much more reliable
than `source ~/.zshrc`.