3.7 CLOS optimizations

3.7.1 Using many classes does not affect performance

Using many classes, or many methods on generic functions, has no particular adverse performance effects. Deep class hierarchies do not cause difficulties either, except under some cases involvingeql specializers, in which the first call to that function after a method or class change affecting that hierarchy may cause repeated traversings of that hierarchy and associated methods.

The Advanced User's Guide - 9 SEP 1996

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