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I haven't found that to be the case. I don't mean that Clozure's performance is bad, but optimizing numeric code is SBCL's reason for being. When I switched from SBCL to Clozure, I had to move things like password hashing out of Lisp, because I couldn't get acceptable performance out of Ironclad.

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In my experience you can get excellent numeric performance out of CCL (and earlier MCL). But there are several issues and it may be a lot of work.

But I definitely agree that the SBCL compiler is a lot better doing these things and it is much easier there.

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