Notebook runs EXTREMELY slow when not connected to internal domain

Honored, friends, colleagues and experts :-)

Im having a strange problem here, which I have not seen before.

I have a customer with a brand new portable Dell Precision workstation.
This workstation is configured to log in to the local Server 2012 domain.
The pc is running Windows 7 64bit with Office 2013, Trend Micro antivirus + Autodesk Inventor.

For some strange reason, if my customer takes this pc out of the local domain it runs EXTREMELY slowly utilizing always 40-70% cpu.
However I can't see what is causing this.
If he take the pc back to the office and restart it, it works perfect again.
I don't know how or why, but it is like the pc is trying to communicate with the server.

Do any of you have some suggestions? :-)
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Rick JohnsonSystems AdministratorCommented:
It sounds like something in his domain group policy has to time out before allowing it to run...also, check in his startups, is he trying to mount drives or run scripts that are domain based?

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Fred MarshallPrincipalCommented:
If there is 50% cpu utilization then you should be able to see the offending process or processes in Task Manager with all processes being shown.  Is that not the case?

It may be illuminating to connect this computer to the internet on a non-domain network.  
The idea would be to prove this theory:

Some applications rely on web interaction (more and more as time goes by).  Without an internet connection, there can be app's that take up time by waiting in rather inelegant ways - thus slowing down the computer.
Though I'd not expect the high utilization, a DNS issue could cause extreme slowdown.
ipconfig /all

and confirm what is being used for DNS.  If the primary DNS is a device on the domain LAN, then it will take a while to time out before trying the secondary DNS (if there is one configured).
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OhmitAuthor Commented:
Something is stressing the cpu and I can't determin what! :-)
Just seems like a lot of the "normal" processes is running constantly.
If I rum ipconfig /all I can verify that all ips is comming from the local DHCP with google's dns as the primary.
Fred MarshallPrincipalCommented:
have you tried running ProcMon?  That gives even more detail than Task Manager.
OhmitAuthor Commented:
Nope. Where is procmon?
Fred MarshallPrincipalCommented:
Rick JohnsonSystems AdministratorCommented:
Procmon should help narrow down the offender. I mis-read your original post. If the machine is part of the domain, it runs fine, but if the machine is disconnected it ALWAYS runs slower, or just at startup? Once everything is up and running, does it work okay?

If just at startup, I still think something in Group Policy is needing to time out. If always slow, looking at the running processes should tell you what is happening. Are there monitoring programs that run on the computer and point to something on the domain?
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