I have scheduled PowerShell scripts running every 10 seconds or so. This is for custom monitoring purposes for an application we use. The scripts are pretty basic and usually are just doing API calls and aggregating some data. After I installed KB4284880 on Server 2016 I’m seeing a substantial increase in CPU utilization all of a sudden from ~5% average to ~50% average. See: https://imgur.com/a/GZS1an9
I rolled back the update and the issue went away. I re-applied the update and the issue came back.
I looked up the patch notes and could not even think why this would be an issue. Is anyone seeing similar issues or know of a way I can troubleshoot this further?