Powershell-3 on Windows Server 2008 R2 is incredibly slow. How come?

Hello,

I installed powershell-3 using Powershell_3.0_Windows6.1-KB2506143-x64.msu.

Now powershell takes a felt eternity just to expand
get-he
in the powershell command line to get-help. It consumes 98% of the CPU time.
So I decided to uninstall this KB. Worked ok. Got back Powershell-2. Was behaving normal again.

So I wanted to make sure and was hoping when re-installing KB2506143 that this error would be gone.
But as powershell-3 is back on the server, so is this intolerable delay in the powershell command line.

Would anybody know how to remedy this? After all powershell-3 has left the beta state.

Also too bad that there is no repair function in programs and features.

Thank you.

Andreas