Earlier quoted context omitted.
I started panicking mildly thinking my drive was failing or something. And just before this, I finally managed to fix Spotlight pegging one core at 100% constantly. Next thing, I reboot into a laggy system. macOS is my favorite OS, but the shit I put up with... it's basically an abusive relationship at this point.
Same. Panic attack. Thought the SSD was dying. I ran Disk Utility diagnostics and started coming up with plans to reformat and restore as a last resort. Apple folks in this thread, this was terrible
I almost cannot believe the actual cause. Absolutely awful experience.