When Windows accesses a directory on an NTFS volume, it updates the LastAccess time stamp on each directory it detects. Therefore, if there are a large number of directories, this can affect performance.
Open your registry and find the key below.

Create a new DWORD value, or modify the existing value, named "NtfsDisableLastAccessUpdate" and set it to "1" to prevent the LastAccess time stamp from being updated.

Registry Settings
System Key: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem]
Value Name: NtfsDisableLastAccessUpdate
Data Type: REG_DWORD (DWORD Value)
Value Data: (0 = disable, 1 = enable)