Windows Server 2008 R2 takes a looong time to access file shares

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http://serverfault.com – I have two shared drives that travel with me when I log into remote servers. I find that Windows Serve 2008 R2 hosts have a hard time accessing them quickly. Doing a "p:" (to change to the shared volume) takes a few seconds and any interaction with the drive ("dir") also takes several seconds every time. Once an interaction has started, everything is as fast as expected. I think this affects elevated command prompts only. Does Windows Server 2008 R2 have a problem accessing shares? How can I fix this, as it is becoming quite annoying? (HowTos)