Sometimes it is less costly to store a result which is often needed than
it is to compute it each time. Caching replaces computing time with memory
use. Of course, one still must /find/ the result (which can be non-trivial
in large systems with many results) and retrieve it (which may be non-trivial
when the "result" is large or memory is in short supply... which is always).
file: /Techref/method/caching.htm,
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