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> but they obviously provide inconsistent performance

No. Unless you're using a "burstable" (overcommitted) instance family, this shouldn't be the case. The performance will be consistent, but you may get preempted before you finish your work. I would keep those concepts separate.

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That's true, however a lot of spot usage ends up being heavily diversified across instance types in order to avoid momentary supply issues and optimize cost.

Across different families, CPU performance can vary by a decent amount.

Sure, but you should still keep the concepts disjoint. "I took whatever I could get" isn't the same as "spot instances are inconsistent".

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