Still, with modern NVMe SSD speeds, usually the network will be the bottleneck. My system with a budget WD Blue gets a decent 1800MB/s sequential write (which somehow caused Win10 to freeze and my taskbar to disappear for a few seconds :/ ) and 2600MB/s sequential read, so even if everything else is unoptimized and the file has to be copied it will still take <1s for your hypothetical 1GB file. Copying the file over a 1Gb network link will take an order of magnitude longer.