Common sense says you would want CSM enabled. If it's 'very slow if CSM is disabled' then the bios is functioning as intended. A sub function of CSM (read below) is to provide USB legacy support for keyboard and mouse, by emulating their classic PS/2 counterparts. Any keyboard/mouse that isn't USB3...

Keyboard not turning off after shutdown=Disable ERP in bios.
m.2 pcie4 not recognized=probably installed in wrong slot read X570 Master manual

Been there Done that..............

Couldn't agree more. GB needs to scrap this whole F31 joke and rewrite a whole new bios. Been building rigs for 20 years and never seen nothing like this insanity. Don't know why they just don't ask for help from AMD to get this mess finally sorted out....

Have any of you guys thought about just running stock optimized defaults until GB releases new Final bios versions for these boards. Don't know why ppl keep beating themselves up trying to OC when they know these bios are Beta versions. Can't blame the hardware for not doing what it ain't set up to...

Looks like you've got some serious COOLING issues. You need to spend some money and get yourself a quality ventilated case, some quality case fans and kick that Corsair H100i Platinum to the curb because it obviously ain't getting the job done. A properly cooled processor idles around 30c....