Make Tech Easier has published a guide that will walk you through the steps to discover the processes that are using too much CPU on your Mac and how to fix them.
How to Fix High CPU Usage on Your Mac
High CPU usage can lead to several problems on Macs. If left untouched, you may encounter application crashes, a frequent jittery interface with a spinning beachball, overheating, shorter battery life, and worse – kernel panics. This tutorial shows you the steps to identify the processes using excessive CPU and how to fix them.
How to Fix High CPU Usage on Your Mac