That's the sort of thing that has been happening with computer chips for the last couple of decades. And it will continue for the next couple of decades. Automobiles must be a certain size to carry passengers, and can't safely go past a certain speed. There are no such limits on computers. A computer is just of bunch of switches that store information.
Information has no size and can go any speed up to the speed of light.
Each switch in the computer stores one piece of information, on or off. Decades ago, magnetic relays, like some switch machines use, were used as the switches in computers. Then vacuum tubes, then transistors, now microprocessors containing millions of switches on a piece of silicon no larger than your thumbnail. In a few years, a few atoms will make the switches. This is already done experimentally.