People pay a lot of money on optimization apps or cleaner tools in order to speed up the Mac. At for me, using the following solutions is worthy enough to speed up Mac. This works correctly on Mac OS X 10.11 El Capitan.
1. Optimize the Disk using Disk Utility
- After pressing the power button, keep holding down the ‘command’ + ‘r’ until the Mac is booted into recovery mode
- Run Disk Utility from the top menu —> Select the Macintosh HD —> Click on First Aid button.
The process may take a while to completely optimize the disk
2. Delete the old Login Items
Trust me, after years using the Mac, old Login Items would slow down your mac lightly. How to remove old Login Items, which are unnecessary?
Go to System Preferences > User & Groups and the Login Items tab.
3. Reclaim Disk Space
To check disk space usage, you can use Disk Utility (found in Applications/Utilities folder) and see the useful info. You may want to take a look on this article to see how to remove the other data: http://www.igeeksblog.com/what-is-other-on-mac-how-to-remove/
The less data the OS carry in the same time, the faster the OS runs.
Please share if my post is helpful