Slow performance when browsing directories and copying files residing on a server

  • 7002232
  • 30-Mar-2012
  • 14-Dec-2013

Environment

Novell Client 2 SP2 IR2
Windows 7
Windows Server 2008 R2

Situation

Browsing files and directories and copying files that reside on a server is slow. 

Resolution

One or more of the following may resolve the issue;

1. For Windows 7 and Windows Server 2008 R2, Microsoft has released a hot fix to address the issue of "TCP window scaling does not work when network latency is between 1 millisecond and 8 milliseconds." Please see Microsoft KB Article ID 2675785 for additional details.

2. Adjust Windows TCP/IP settings:

  • From an elevated command prompt (Run CMD.EXE as Administrator or equivalent) in Windows 7, run the following commands:
netsh interface tcp set global rss=disabled
netsh interface tcp set global autotuninglevel=disabled
netsh int ip set global taskoffload=disabled

3. Disable RDC ( Remote Differential Compression).
  • Menu driven: Control Panel | Programs | Programs and Features | Turn Windows features on or off
  • Command line:  ocsetup MSRDC-Infrastructure /uninstall
4. Disable power management for the network card in Windows Device Manager

5. Disable TCP Delay Acknowledge.
  • Open the Windows registry editor, then navigate to  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{NIC-id}
  • There will be multiple NIC interfaces listed, for example: {1660430C-B14A-4AC2-8F83-B653E83E8297}. Locate the one with your IP address listed. Under this {NIC-id} key, create a new DWORD value: TcpAckFrequency and set the value data to 1 (disable).

6.  Change or create [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters] "MaxUserPort"=dword:0000ffff (hexadecimal) or (65535 decimal)   (Please see http://technet.microsoft.com/en-us/library/cc938196.aspx for additional information)

Additional Information

The intent of this article is not to provide a solution for all slow browsing and slow file copy issues.  The above suggestions have been known to resolve slow performance issues for customers experiencing the specific symptoms outlined in the Microsoft article referenced above.

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