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I am seeing a process titled, 'Locum' show up in my OS X process list. Does anyone know the details of what this process does?

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If you see that is using a large amount of resources, you are probably emptying your trash or the trash is being emptied in the background; it can also eat CPU if you have a large number of "preview" windows opened. – user117090 Feb 6 '12 at 21:37
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Locum also appears when copying old Time Machine data sets from one drive to another. The finder needs escalated privileges to be able to copy everything that's inside the backups. – Tonin Feb 13 '13 at 14:50
    
@user117090 — What would the process Locum have to do with "preview" windows ? – Nicolas Barbulesco Nov 24 '13 at 17:15
up vote 43 down vote accepted

Google says that it's a helper process for Finder, that does all the stuff Finder would need escalated privileges for.

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Yup, Locum is used for privilege escalation: discussions.info.apple.com/message.jspa?messageID=8293436 – Madison S Nov 5 '10 at 21:06
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And you should always kill Locum whenever you kill Finder while doing anything privileged because it'll keep hogging resources for whatever Finder was doing. – Jeff Burdges Apr 14 '14 at 15:46

In addition to what's said, if you choose to "Secure Empty Trash..." in Finder, Locum will consume a lot of resources because it will re-write the data (possibly several times) of where your trashed items resided. This will ensure you can never ever recover them.

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