Remove UNC paths that aren't active or servers that aren't reachable or are removed.

On the DFS tab, locate all active referrals.

Right-click the shared folder, and then select Properties.

If the issue does not occur when you use the UNC path, follow these steps to verify the DFS referrals. If it is still slow when you use the UNC path, see slow performance when you copy a single file, a folder, or multiple files.

On the DFS tab, you see the UNC path in Referral list.

How to determine the UNC path of the DFS shared folder: This step can help you determine whether the problem is caused by the DFS path. Then, you can check whether the issue still occurs. Try to use the UNC path instead of the DFS path to open the shared folder. Let's determine whether the problem is caused by the DFS path. For the Distributed File System (DFS) shared folder, the DFS tab is displayed. To do so, open the properties of the shared folder. Let's verify the kind of the shared folder.

If issue doesn't occur, see client-side troubleshooting.

If the file copy speed is still slow, see server-side troubleshooting.

If the speed is normal, use another client computer to copy the files from or to the shared folder. If the issue still occurs, contact the driver manufacturer for further troubleshooting. If the file-copying speed is unusually low (much slower than average speed), try to update the driver for your storage. On the file server that hosts the shared folder, copy the file to its local hard disk. Slow file copying can be caused by storage issues, client issues, and server issues. This article helps administrators to diagnose and resolve the issue of slow file copy in your organization.Īpplies to: Windows 10 - all editions, Windows Server 2012 R2 Original KB number: 10118 Determine the cause of the issue

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