On my home LAN connected with 10gbps fiber between MacBook Pro and server, 10 feet away, I get about 1.5gbps vs the non-network speed of the disks of ~50 gbps. (Bits, not bytes)

I worked this out to the macOS SMB implementation really sucking. I set up a NFS driver and it got about twice as fast but it’s annoying to mount and use, and still far from the disk’s capabilities.

I’ve mostly resorted to abandoning the network (after large expense) and using Thunderbolt and physical transport of the drives.