@iSazonov can you give a before and after for a perf comparison? Call Get-CimInstance or Get-Content for every System.Diagnostics.Process object sounds expensive.

The test can be as simple as:

Measure-command { 1..100 | % { get-process } }

@adityapatwardhan It is "on demand" property - you evaluate it only if you explicitly call the property. But if you call you get a slowdown. It is not in default output so users don't see slowdown in common scenarios.
Notice, I found WMI is very fast on latest Windows versions (Windows 10 and Windows Server 2019). If someone provides feedback that it's still slow we could consider a P/Invoke.
On Linux /proc works fast.
For MacOs I do not know API. I am going to open new tracking issue for this after the PR will be merged.

For both Linux and macOS, I wonder if it would be ok to run ps to cache the command lines and map it to the object?

Using /proc is simple and reliable on Linux so no need to create a workaround.
I haven't Mac and can not create even a workaround. Nonetheless I hope there is a good API for that.

@TravisEz13 @JamesWTruher Do you know of a macOS workaround for this?

@iSazonov I am not sure if we should take this PR without having a solution for all platforms. This introduces gotchas and makes cross platform scripting difficult.

@iSazonov @SteveL-MSFT - thoughts?

My plan is to open a tracking issue for MacOs. We have a lot of time before release and can investigate how enhance the feature on MacOs.

The APIs will probably require some native coding on the mac.

We can probably use the same apis as top.

https://opensource.apple.com/source/top/top-111.20.1/libtop.c.auto.html

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@iSazonov Please open a tracking bug for macOS and also open a issue for documentation as per the PR template.

@adityapatwardhan Tracking issue #12832

As for doc issue - do we really need to document this? It seems we haven't docs for extended properties at all.
/cc @sdwheeler

@iSazonov No, we don't document the extended properties. But this is worth adding to the release notes.

@iSazonov Thank you for your contribution!

🎉v7.1.0-preview.4 has been released which incorporates this pull request.:tada:

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