Python’s pip package manager is widely used to download and maintain python
packages. Lately, I have noticed pip taking quite a while when downloading new
packages.
I have found that you can increase the package download speed considerably by
simply changing the default pip mirror by adding the following to
~/.pip/pip.conf file:
[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple
Source: Stackoverflow