If for any reason your Mac seems to be running slower than necessary, just go through these few tips that would be outlined here, at least the guide would help you identify and fix the challenge. Just like Windows PC, there are many reasons why a Mac might be running slower.

Source: http://www.recruitmentlogin.com/2018/08/see-how-to-speed-up-slow-mac-or-macbook.html

















Some Tips

Use Activity Monitor. If you want to see what apps are using up your system, open the Activity Monitor in the Utilities folder.
Turn off visual effects. Most Macs are now capable of running Mac OS X Mavericks without any trouble. ...
Update your software (and set to auto update) ...
Clean up your hard drive.