For P-rating we have a term and definition in Technology.

Short for performance rating. A microprocessor rating system by IBM, Cyrix, and others, based on throughput in realistic applications. Formerly, microprocessor clock speed was widely used as a method of rating, but it does not account for differing chip architectures or different types of work people do with computers. See also central processing unit, clock (definition 1), microprocessor.
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