Navigate the the location below in your registry and make the corresponding change.

Create or edit the existing DWORD value named:

'MaxCmds' The range is 0 - 255 and the default is 15

'MaxThreads' Set it to the same value as MaxCmds

You may also want to increase the value of 'MaxCollectionCount'.  The default is 16 and the range is 0 - 65535.

 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters] Data Type: REG_DWORD