I found a few things to change in W7 that helped me.
There is a hotfix at http://support.microsoft.com/kb/978869 that fixed my problem.
1. Click on the Start button.
2. Type SECPOL.MSC in the search window.
3. Press Enter.
This will start the security policy editor in the Microsoft Management Console (MMC).
4. In the security policy editor, select Local Policies .
5. Select Security Options on the left side.
6. Scroll down to and double-click Network security: LAN Manager authentication level .
7. On the Local Security Setting tab, drop the list of options down and select Send LM & NTLM – use NTLMv2 session security if negotiated .
In addition, the SECPOL.MSC setting Network Security: Do not store LAN Manage hash value on next password change must be set to Disabled (meaning that the LANMAN should be stored when the password is changed).
A restart of the PC is required after making this security change, in order for the change to take effect.
Many Windows 7 users have seen performance issues when opening IFS documents on a NetServer network drive. To correct this problem, do the following from the Windows toolbar:
a. Click on Start.
b. Click on Run.
c. Type services.msc and click [ok].
d. From the list of Services listed, double click on Web Client , and change Start-up type from Manual to Automatic. This value defaulted to Automatic in Windows XP. The default was changed to Manual in Windows 7. Having this service automatically start up (and therefore always active) should improve performance significantly.