Cubase Pro 12 glitching after upgrade. Please help

Hi everyone. Been trying to fix this for 3 weeks now. Did an upgrade on my tower PC computer and now all of my Cubase projects are glitching, sporadically glitchy, every 5-7 seconds. I’ve turned the buffer rate WAY up, but that’s a band-aid for a broken arm as it makes recording problematic and can’t continue this way.

Upgraded to : Windows 11, 12th Gen Intel (R) Core™ i9-12900KF, 32 GB RAM, NVIDIA Quadro NVS 295, Focusrite Scarlett 18i20 2nd gen

ANYONE out there willing to help?? Thank you.

I built a powerhouse PC a couple years ago and thought Cubase would hum along like a spring day… not so much… there are a lot of tweaks that people, who are smarter than me, have mentioned on the forum. I went looking for the info and now cannot find it… :grimacing:
There are BIOS settings and Windows tweaks galore…