At least on this office LAN, this is helping. Not clear whether it helps everywhere and all.
In Regedit, go to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces
You’ll notice several GUIDs. These are all of the network interfaces Windows knows about, virtual, Bluetooth, whatnot. You’ll want to try adding the below to any of them that you use.
TCPAckFrequency = 1
Technically this is called “disabling delayed ACK”. It seems to be helping me a lot for all accesses, including SMB, intranet, and Internet.