It was past two in the morning when the numbers came in, and they were savage. Eight and a half, nine gigabits a second, a fat single-file firehose screaming down one copper cable from the big AMD box to the laptop, and the laptop taking it, gulping it, every byte landing on disk and synced like a signed confession. Nine times what the gigabit wire could ever carry. I had seen rsync choke at three on the same cable, one thread grinding like a man trying to bail out a lake with a coffee cup, and I understood that the wire had never been the problem. The wire was waiting for us.

Consider the terabyte. Every serious person has one now: four hours of camera footage, a season of raw photographs, the virtual machine you swore you would delete, the model weights some committee decided you needed. On gigabit that terabyte crawls across in about two and a half hours, long enough to lose faith in the whole enterprise. On this link, with a tool that keeps its workers moving, it is fifteen minutes. Fifteen. You start the copy, you make the coffee, and the thing is done before the cup is cool enough to drink. That is not a benchmark. That is a different way to live.

But hear me, because the swine who sell switches will not tell you this: the fast wire is useless for a hundred thousand tiny files. I watched them go at a fraction of a gigabit, the receiving disk creating them one at a time like a clerk stamping forms in triplicate, and no amount of copper would have hurried it. Ten gig is for the big stuff: footage, disk images, backups, datasets, the heavy freight. Put your small files in an archive, buy the card, run the cable, and stop waiting on your own machines. The future arrives at nine gigabits a second, and it does not care whether you are ready.