High CPU usage by python install for home assistant

I see a very high CPU usage for a python3 install process that relates to Home Assistant:

/usr/local/bin/python3 -m pip install --quiet httplib2==0.10.3 --no-cache-dir --upgrade --constraint /usr/src/homeassistant/homeassistant/package_constraints.txt --find-links https://wheels.home-assistant.io/alpine-3.12/armv7/ --prefer-binary

This is being executed periodically and requires very high CPU usage, making my raspberry Pi unresponsive.

Anyone can clarify what this process does/installs?
And what can I do to prevent running (or at least limit CPU) ?