[jem]

Think of it like a bucket-chain. At one end is your NAS, and at the other is the device you are trying to copy files from or to. The chain is only as fast as the slowest link. So, you have a bucket chain composed of Olympic athletes, but three of them have dropped out and have been replaced with ‘random blokes from the pub’. You see how this will go?

So look at the slowest link in the chain, your NAS, does it have a 2.5 Gb/s port, or only a 1 Gb/s connection? If the latter, then that immediately limits the speed. But suppose it does, fine the NAS can work at full speed, but the VM hubs only has a single 2.5 or 5 Gb/s port, everything else is limited to the speed of the other ports which is 1 Gb/s.

So, consider this, you have a NAS with a 2.5 Gb/s capable port and you connect it to the same but only port on the VM hub. You have a PC or laptop with a 2.5 Gb/s capable port, but you can only connect it to one of the other ports on the hub which are all limited to 1 Gb/s.

And that’s the bottleneck - go and buy a laptop with a 10 Gb/s interface - it won’t help. You will never, ever get a faster speed than the slowest component in the link.