Please open the ACTIVITY MONITOR app and determine which process/app is taking up the Processor capacity. Once you identify that process then STOP the process by highlighting it and choosing the X at the top.
Have you also tried completely shutting down the MacBook Pro and then rebooting it?
Is this an Intel or a M1 MacBook Pro?
How long as it been since the update was installed? At times, it takes a few hours for the macOS to index the spotlight and perform other maintenance tasks before the processor returns to normal operation.
Axel F.