Why my pip install -e . takes 4 minutes

[LukeLIN-web]

I am trying to install a cpp and python mixed project with editable mode. I am using: pip install --no-index -U -e .
https://github.com/quiver-team/torch-quiver
However, when I modify and rebuild the system, I use pip install --no-index -U -e . again.
But it takes 4 minutes, make should not be so long time.
Did you have some ideas?
Thank you for your help!