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> The universe just calculates everything everywhere all at once and there's no way to fit it into human comprehension.

Because the speed of light is finite, the universe wouldn't have to calculate everything everywhere all at once.

If the calculations around Alpha Centauri stopped updating for a while for a few months, and then caught up quickly, we wouldn't notice, because it's a few light years away.

https://m.youtube.com/watch?v=q2nNzNo_Xps

It's the idea that the wave function of reality doesn't collapse until it is observed ?

What do you mean by "the wave function of reality"?

Wave function is just a handy way to describe quantum states that can't be discretely represented otherwise in mathematical equations.

Only some interpretations of quantum mechanics have a collapse of the wave function.

au contraire. nature loves 'straight lines' (just on non-euclidean manifolds).