Slow cd in a specific directory

This issue seems paranormal to me: I have a specific directory to which it’s very slow to cd into, using the terminal. cd to any other directory is fine.
Using nemo gui, there’s no lag. This directory is a git repo. (I have other repos and they encounter no lag). I don’t know what data to provide here that could lead anyone to a solution, because honestly I really don’t understand that.
Any ghost hunter here ?

Clone it elsewhere and see if it does the same.

I tried, it does the same. So I guess it’s something in the repo.