Improve Baseline Models

[sibre28]

Is your feature request related to a problem?

Currently the Baseline Functions of #811 take about a minute, with the extended search taking even a lot longer.
We could maybe improve the performance of these models by improving the multiprocessing.

Desired solution

Try out other multiprocessing libraries, this one seems to be promising and could also improve User Feedback, especially with the progress bar:
https://github.com/sybrenjansen/mpire

Possible alternatives (optional)

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Screenshots (optional)

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Additional Context (optional)

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[lars-reimann]

Generally, I'd rather not add another dependency for this. If there are significant performance gains, however, we can consider it. But we'll need to benchmark it on our own case.