Hi,
It is not suggested to disable services without one specific purpose. Basically,there is a reason they are running. Some running services need their dependency service to be running.
You can disable software or Windows features from control panel, this will disable the corresponding services.
To view the most memory consuming process, you can simply open task manager by right clicking on taskbar, choose "Start Task Manager", under the processes tab, you will find which one consume the most CPU usage.
Also, open Resource Monitor by typing it from Start menu will give your more detailed information.
Regards,
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