That's what I was trying to express, though: if "the wall clock runs slower", that's less useful than it sounds, because all you have to interact with is yourself.
I exaggerate somewhat. You could interact with databases and computers (if you can bear the lag and compile times). You could produce a lot of work, and test it in any internal way that you can think of. But you can't do outside world stuff. You can't make reality run faster to keep up with your speedy brain.
You can interact with yourself, and everyone else like you.
There is a lot of important work where humans thinking about things is the bottleneck.
Possibly. Here we imagine a world of artificial people - well, a community, depending how many of these people it's feasible to maintain - all thinking very fast and communicating in some super-low-latency way. (Do we revive dial-up? Or maybe they all live in the same building?) And they presumably have bodies, at least one each. But how fast can they do things with their bodies? Physics becomes another bottleneck. They'd need lots of entertainment to keep them in a good mood while they wait for just about any real-world process to complete.
I still contend that it would be a somewhat mediocre super power.