Windows 2003 Roaming Profiles vs Vista

I have Windows 2003 Server Domain Controller with Active Directory. The Users
are with Roaming Profiles. The computers of the Company are Windows XP and
2000. I’m testing a new Laptop computer with Windows Vista and I have two
problems. The first is when I Log Off the computer is taking too long (35
min) to log out. The second is when I change password is taking again too
long (25 min) to change it.