The system process configd would regularly consume 100% of the CPU. A Machine with a BackstoryThis MacBook Pro actually replaced an almost identical model (with a 500GB SSD) whose keyboard had begun to fail. Despite not being used in years, it was triggering configd into a CPU loop, damaging system performance and hardware. macOS Protections (and How to Work Around Them)macOS uses System Integrity Protection (SIP) and Signed System Volumes (SSV) to protect core files. My Mid 2015 MacBook Pro is back to being a quiet, powerful daily driver — and I intend to keep it that way.