Part 1 of 2
Use the Activity Monitor application and make sure to use View >> View All Processes
What process or processes are using the Most CPU and Memory.
Often times - the issue maybe not be one single Process but a combination of Processes
Also, when the computer is using so much Memory - it can be a indicator of a Lack Of Empty Spaces on the Drive.
In which case, the CPU and Memory usage would become Much More because it is searching for Empty Space to save all the Changes the user is performing.
Also, depending on the number of Open Tabs in your Browser, they can also affect Memory Usage.
Part 2 of 2
Suggest the User start with Points 1 to 4 and then Test
Still having issues, move onto Steps 5 and 6 and Test Again
Still no resolve - move onto Step 7 and follow instructions therein
1 - Restart in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.
2 - Safe Mode will also eliminate Third Party Software, extensions and drivers from loading. It will only load the Minimum amount of Core Apple Processes to allow the the computer to function at a reduced Level of Performance
3 - Does the issue present in this mode ?
4 - Sometimes a Safe Boot followed by a Normal Boot will just put things right.
5 - If not - there could be something in the main User Account playing up. To further isolate this - Set up users, guests, and groups on Mac. Then log out of the Main User account and log into the dummy account and test again if the issue persists.
6 - If the issue is present in the dummy account - then, this appears to be a System Wide issue on the computer.
7 - Download the Application Etrecheck directly from the Developer.
This is a Diagnostic Tool that makes no changes to the computer.
It makes a coherent and readable inventory of both the Hardware and Software used on the computer
The application is free or paid from added features.
The Report will Not Reveal Any Personal Information.
Post back the Full Report - copy and paste - >>>> using the Additional Text Icon ( 3rd Icon to last ) <<<<
