Fastest “normal” way would be write it to a USB 3 drive on machine 1, read from drive later on machine 2. An SSD would be best. Even with having to do the write and read in two phases, I’d still expect it to be faster than a 1G network.

(Less normal ways would be things like Thundrerbolt SSDs, 10G or 40G ethernet for direct transfer, etc. But if you have that kind of tech already in place, then you’re not asking. ;)

Mine is sadly over an order of magnitude higher than this…

I am really struggling to parse this. What?

Hard drives are for capacity. SSD’s are for performance. This has been settled for a number of years, and is why you see multiple levels of caching in front of any modern enterprise storage system.

If you need IOPS, you need SSDs. The days of getting IOPS from multiple hard disks have been over for a decade.