Even worse (to me) is the P-cores have two way hyperthreading enabled so Intel says the CPU supports N(2)+M threads. While Intel has always behaved as if their hyperthreading meant a chip had N(2) core of performance, in the real world it's was more like N(1.5) at best.

So a CPU with 20 threads has maybe eight running at full speed of a P-core and the other twelve pretty gimped comparatively.