Why is my mac running so slow after an update?

Episode 1720 (2:15:57)

LaVerne from Bronx, NY
Catalina Islands

LaVerne updated her 2012 Mac to Catalina and now it's going slow and she's getting kernel panic reports. Leo says it's likely a driver that is failing. It could also be a flakey hard drive. But when she logs into the guest account, it runs just fine. Leo says that indicates a bad profile. You can wipe the drive and start over, or create a new profile and then remove the other one.