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"John.Cowan" <jcowan@xxxxxxxxxxxxxxxxx> writes: > I assume you mean "must not affect the behavior, but may affect the > performance" (= speed). Unfortunately, you have to be intimately > familiar with your CL implementation to know when declarations are > useless, when they are critical to performance, and when they actually > make things worse. Yes, but I don't see any way around that problem. It should be possible to guarantee that declarations never make anything worse...