Intel Ice Lake "0x78" Microcode Update Having Small But Measurable Performance Hits

Following new Intel Ice Lake CPU microcode being published on Friday without any change-log and not updating prior Intel CPU family microcodes, I've begun looking at the performance as this first Intel CPU microcode update for Linux users since November. From my initial weekend testing there does seem to be some small but measurable and consistent performance impairments for Ice Lake from this microcode upgrade.