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From: Richard Stallman <rms@santafe.edu>
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Subject: Re: Regular expression performance in emacs, number of cached regexps
Date: Mon, 18 May 1998 22:45:12 -0600
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      Well, as people are wont to say nowadays - memory is cheap, and so is
    disk.  If I'm reading the code right, the regexp cache only takes 398 bytes
    (worst case on a 64bit machine)... so 20 cache entries are only 7960 (~
    7.75k).

There must be a misunderstanding, because the data in a cache
entry has variable size.  Perhaps you're looking only at the
cache structure itself and not its contents.