Linux

And most people don't complain about computers being slow anymore. And when they do, it's usually because of memory, disc, or network speeds. It's almost never because of CPU cycles. The people complaining about performance that's related to cycles are usually complaining about GPU processing.

It's almost never a CPU power issue, anymore. Unless you're a developer or scientist, and you're actually trying to compute something. I have two beefy computers in my house - my desktop, for coding, and my media server, because Jellyfin insists on transcoding everything. The rest are all ARM, and mostly old ARM, and they're all perfectly capable of doing their jobs. RISCV would be, too.