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Lazy evaluation.

Laziness speeds up computers.

It's not anything new, that laziness (lazy evaluation) speeds up computers.

Values are not evaluated unneccessarily, freeing up processor for other important evaluations.

It has its uses in conditional instructions ('if') argument evaluations, but not only... it's easy to imagine how (hint: OR logical operator does not need to evaluate everything, to know result of whole logical expression).

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