It is something "AI alarmists" think about.

Infinite? Why isn't AI subject to the heat death of the universe?

Really,Asimov is more on point and more fun to read than all these Superintenlligence pundits

"Unhappily, Zee Prime began collecting interstellar hydrogen out of which to build a small star of his own. If the stars must someday die, at least some could yet be built."

I miss him I only started to read his book after his death. RIP Good doctor

My point being, there's plenty of time before coming heat death starts to cause problems :).

There are even many things that we already suspect are just engineering challenges. Like rocketry, hacking and robotics. Even if an AI can just act like a million engineers and scientists working for a decade per second, without any higher level of thinking, it could do some incredible things.

Humans are able to calculate plenty with a relatively small amount of mass and energy.

There is a large class of problems for which you have fairly good solutions up front, but where even vast amounts of additional computing power don't help you do much better.

Unless you come out with some algorithm that is sub-exponential for the important cases, and only gets slower for stuff you don't care about, or happen very rarely in practice.

People invent those algorithms all the time, for lots of kinds of problems.