I'm just wondering what you mean by "massive slowdown".
Every program slows to a crawl. The weirdest part is that all sounds stop (e.g., no volume, can't change it, no streaming at all), and new programs cannot open. I'm getting the spinning beach ball. It's not the hardware as it's a brand new Mac Studio base model with 32gb and 2tb. What's more complicated is that programs that are already open, mostly function correctly but without any sound or video. In other words, I can browse on Firefox and Safari but youtube or streaming will just buffer without any sound.
I did try killing the login program in the activity monitor but it wouldn't stop. I've erased everything and started over again but I have a feeling this error is going to come back.