The Activity Monitor is the first step to finding out which programs are using the most resources and slowing down your Mac. To access the display, type the term “Activity Monitor” in the Finder search box. You can also find it under “Utilities” in your Applications folder.
The monitor displays the CPU, memory, power, disk, and network usage of your programs. If you want to make your Mac faster, pay special attention to the CPU usage. Click on “% CPU” to list all processes from largest to smallest usage. Check the memory pressure graph under “Memory” – if you see yellow or red bars, your memory is no longer sufficient.
In the activity display, you can speed up your Mac by terminating individual processes. This is only a temporary solution. Most likely, your Mac needs to be properly cleaned and permanently freed from unused programs.