After the update the process is using less resources, but still using a lot of resources. The server is at 165%, and I need to keep killing the process ext-log-browser-parse-maillog for the server to go back to normal (it was usually at 1-2% load).
After one day of cleaning the Task Manager, the problem started again. So I have updated PLESK to Obsidian 18.0.63 (I was in Obsidian 18.0.62). Will let you know if the problem persists.
Same issue, started 2 days ago. I used the TASK MANAGER in the GUI and manually eliminated all the hanging processes for ext-log-browser-parse-maillog. After finishing stopping all the processes, resources went back to normal.