Faster Network - TCP/IP Jumbo Frames
If you enable Jumbo Frames in the OS network card settings at fileserver and clients can improve your transfer rate.
Set the Jumbo Frames setting to 7KB or higher if all your devices support it.
Besides the network of clients and fileserver, your switch needs to support them as well.
Do a transfer test before and after you have enabled the setting to check if everything is working fine.