New GitHub issue #118891 from Privat33r-dev:<br>

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## Issue

Usually doctest's action's [Run documentation doctest[^1] job takes around 12 minutes[^2] to execute. Most of this time is taken by the internal framework doctest.py[^3]. The issue is caused by unparallelized execution of tests. 

## Solution
Since the tests are not interconnected (between different doc files), they can be easily parallelized. I suggest using `ProcessPoolExecutor` that will be suitable to "bypass" GIL (assuming that tasks are CPU-bound). Github runners have 4 cores available[^4], so, potentially, it can speed up execution by up to 4 times.

@AlexWaygood @erlend-aasland 

[^1]: https://github.com/python/cpython/blob/7ac933e2609b2ef9b08ccf9c815b682b0e1ede2a/.github/workflows/reusable-docs.yml#L108
[^2]: https://github.com/python/cpython/actions/runs/8922903843/job/24506021604
[^3]: https://github.com/python/cpython/blob/main/Lib/doctest.py
[^4]: https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories
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<a href="https://github.com/python/cpython/issues/118891">View on GitHub</a>
<p>Labels: docs</p>
<p>Assignee: </p>