Why its faster:
-prune Stops Recursion: Once it reaches /mnt, it skips it entirely (including subdirectories).
-not -path Scans All Directories: It still traverses into /mnt before filtering, making it slower for large directories.

Excluding /mnt good for excluding win pc files in wsl and excluding external or other mounted drives

Examples:

find / -path '/mnt' -prune -o -name 'zellij' -type f 2>/dev/null