Radeon Software 21.30 PRO vs. Mesa 21.3-devel + Linux 5.15 Gaming Performance

For those wondering how AMD's latest-generation Radeon RX 6000 series is competing now between the Linux driver options of AMD's official Radeon Software for Linux 21.30 "PRO" driver stack and the latest upstream, fully open-source driver components from Mesa and the mainline Linux kernel, here is a fresh comparison.