Forcing refresh access speed to shares from Windows 7
SMB2 Client Redirector Caches Explained
the slow refresh the contents of shared folders.
solution:
Copy the following contents and enter it in the register.
| Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\LanmanWorkstation\Parameters] "DirectoryCacheLifetime"=dword:00000000 |