The universe is humongous.
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The hard drive space is practically limited to the Big Bang on one end and the heat death of the universe on the other, but it contains all of the data for everything that exists. That's massive.
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The RAM is massive because it's handling all the variables and changes of the present.
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The cache is much smaller as established by the study that found the universe is not locally real. Things only happen once they are observed, but it happens almost instantaneously. Still, the cache is massive because it is handling everything that is being observed at the same time. That's a lot of things.
All of the above are massive extremes. However,
- The processing speed is limited at the speed of light. In comparison to the others, the speed of light is soooooo ridiculously slow, causing a bottle neck.
PS - Massive because it's mass I've observed. Not really tho, you silly goat. Big bang while I swig Tang and watch a twig hang.
This is only true if you operate under a very specific and strict criterion of "realism" known as metaphysical realism. Einstein put forward a criterion of what he thought this philosophy implied for a physical theory, and his criterion is sometimes called scientific realism.
Metaphysical realism is a very complex philosophy. One of its premises is that there exists an "absolute" reality where all objects are made up of properties that are independent of perspective. Everything we perceive is wholly dependent upon perspective, so metaphysical realism claims that what we perceive is not "true" reality but sort of an illusion created by the brain. "True" reality is then treated as the absolute spacetime filled with particles captured in the mathematics of Newton's theory.
The reason it relies on this premise is because by assigning objects perspective invariant properties, then they can continue to exist even if no other object is interacting with them, or, more specifically, they continue to exist even if "no one is looking at them." For example, if you fire a cannonball from point A to point B, and you only observe it leaving point A and arriving at point B, Newtonian mechanics allows you to "track" its path between these two points even if you did not observe it.
The problem is that you cannot do this in quantum mechanics. If you fire a photon from point A to point B, the theory simply disallows you from unambiguously filling in the "gaps" between the two points. People then declare that "realism is dead," but this is a bit misleading because this is really only a problem for metaphysical/scientific realism. There are many other kinds of realism in literature.
For example, the philosopher Jocelyn Benoist's contextual realism argues that the exact opposite. The mathematical theory is not "true reality" but is instead a description of reality. A description of reality is not the same as reality. Would a description of the Eiffel Tower substitute actually seeing it in reality? Of course not, they're not the same. Contextual realism instead argues that what is real is not the mathematical description but is precisely what we perceive. The reason we perceive reality in a way that depends upon perspective is because reality is just relative (or "contextual"). There is no "absolute" reality but only a contextual reality and that contextual reality we perceive directly as it really is.
Thus for contextual realism, there is no issue with the fact that we cannot "track" things unambiguously, because it has no attachment to treating particles as if they persist as autonomous entities. It is perfectly fine with just treating it as if the particle hops from point A to point B according to some predictable laws and relative to the context in which the observer occupies. That is just how objective reality works. Observation isn't important, and indeed, not even measurement, because whatever you observe in the experimental setting is just what reality is like in that context. The only thing that "arises" is your identification.