[n8henrie]

People should be aware that adding additional mirrors (instead of switching mirrors as suggested here) can lead to big slowdowns, as pip has no way to determine whether a given / found wheel is the m best choice without comparing all options, so it will continue to search both locally and all available indices until it can resolve the "best" wheel to download.

Some discussion: https://discuss.python.org/t/why-does-pip-reach-out-to-indic...

I don't recall if this issue is solved by specifying hashes (or perhaps even pinned versions are adequate) -- I would hope so.

[uranusjr]

Note that in this instance the user is setting index-url, so no additional indexes are added, but the default index is replaced. So as long as the replaced index is faster, it will result in a faster install. It’s the extra-index-url option that should be used with caution.

[n8henrie]

Indeed! Which is why I specified:

> adding additional mirrors (instead of switching mirrors as suggested here)