Same here, thought I was going crazy, also had major lag, from what seemed to be something involving trustd and the update servers, luckily I had to update the command line tools and that seemed to rectify that part. What a mess, in decades of dealing with Apple, as well as doing every update they ever did after they gave them away for free, I must say this is by far the worst, incredibly embarrassing, and another item on my list of things driving me away from the brand that seems to have been exponentially growing as of the last couple years.