Blockchains don't scale. The fact that all nodes process all transactions means that the blockchain only goes as fast as the slowest node allowed on the network. If that's something like a Raspberry Pi, then that's as fast as the blockchain goes.
And that's okay! The upside is that the more people can run nodes, the more resilient the blockchain will be. It's much harder to break a 10,000-node blockchain where most nodes run on home computers all across the world than a 10,000-node blockchain where most nodes run in a few datacenters.
But the demand for cheap transactions isn't going anywhere. What's a distributed systems hacker to do?
A single blockchain can't handle unbound transaction volumes, but many blockchains can. Just like how the world's most expensive high-powered mainframe cannot match the capacity of a cloud made out of cheap servers, a single high-powered blockchain cannot match the combi