Dependency resolution much slower when adding secondary sources

[anth2o]

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Mac OS 12.0.1

• Poetry version: 1.1.12

• Link of a Gist with the contents of your pyproject.toml file: https://github.com/anth2o/poetry_slow_additional_source

Issue

Hello, poetry lock is much slower in my project when I add internal pypi repositories as additional sources. My issue is strongly related to this one, but the main difference with mine is that I set the secondary = True for the additional repo.
I would have expected this secondary repo to be ignored when a dependency was found in the main Pypi because of the secondary = True.
This repo gives a reproducible example of my issue

[neersighted]

Duplicate #5096

[JacobHayes]

@neersighted this is #5096, do you mean this duplicates #5959 (or perhaps #4113)?

[neersighted]

Ah, thanks, yes, I meant #4113

[github-actions]

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