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People keep forgetting you need infinite memory to be Turing complete. On a machine with finite memory, all operations are O(1).

Almost, but there are examples of non-termination still unless I am misremembering a definition (ex 20 GOTO 10).

All operations are O(1)?

busy beaver function of (a finite number) is hilariously big, but a constant. So there is a constant bound on the duration of all terminating programs using finite memory.

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