Although we'd all like Moore's Law to continue forever, quantum mechanics imposes some fundamental limits on the computation rate and information capacity of any physical device. In particular, it has been shown that 1 kilogram of matter confined to 1 litre of space can perform at most 10⁵¹ operations per second on at most 10³¹ bits of information.¹

¹ — Lloyd, Seth (2000). Ultimate physical limits to computation.

— Jeff Bonwick (ZFS team)