It’s not only Windows PC that do perform slowly, Macs can perform slowly, too. If your Mac seems to be running slower than it should, the tips here should help you fix the problem and it will start running fast again.
Stay away from programs that promise to make your Mac work faster. Some “cleaning” programs like the Mac version of CCleaner can remove temporary files and free up your storage, but that won’t make your Mac perform faster.
Find Resource-Hungry Processes
Always make use of your Activity Monitor like the Task Manager on Windows to check your running process and consuming many resources. To launch it, press Command+Space to open Spotlight search, type Activity Monitor, and press Enter.
Click the “% CPU” heading to sort by CPU usage and it will display running applications and processes using the most CPU. In some cases, there are so many programs using 99% CPU that you’ll want to end. To force-quit a process, select it by clicking it and click the X button on the toolbar. Make sure you aren’t quitting a programs you are using for something vital.
If this doesn’t work, click the “View” menu and select “All Processes” this will show you all the processes running on your Mac. You can also click over to the Memory section, this is a process eating a large amount of memory which could make your Mac perform slowly. Also try the “Disk” section, this is a process using the disk heavily could also be causing your Mac to slow down.
Mac OS likes to leave applications running in the dock even when you’ve clicked the red “X” button on an application window won’t close it rather it will still be running in the background. In most cases, this isn’t a problem all. However, if your Mac appears to be running slowly, you may want to close some of these applications.
Look for the applications marked with a dot on your dock, right-click or Ctrl-click their icons, and select “Quit.”
Prune Startup Programs
If your Mac is performing slowly after you log in, it may have too many startup programs.
To manage startup programs, open the System Preferences window by clicking the Apple menu icon and selecting “System Preferences.” Click the “Users & groups” icon, select your current user account, and click “Login Items.” Uncheck any applications you don’t want starting when you log in.
If you ever want to make a program automatically start when you log into your Mac, drag-and-drop it into this list or click the “+” button at the bottom of the list and add it.
Reduce Display Contrast
Display Contrast can stress the graphics hardware on older Macs. Reducing them can help speed your Mac.
To get this done, open the System Preferences window. Click the “Accessibility” icon and check the “Reduce transparency” option to reduce transparencies. On OS X Yosemite, this option can significantly speed up some older Macs.
Reduce Your Web Browser Extensions
Your web browser might just be your PC’s problem. The usual tips apply on a Mac, especially considering Google Chrome’s performance is particularly bad on Mac OS X.
Getting rid of some of your browser extensions you use and have fewer tabs open at once to save memory and CPU resources.
You might also want to try the Safari browser included with Mac OS X, which perform better than Chrome. If you can get away with using Safari and aren’t depending on a feature or extension in Chrome, for example, you might want to give it a serious try.
Disable FileVault Disk Encryption
FileVault disk encryption comes with your PC enabled by default on Mac OS X Yosemite. This helps secure your Mac’s files if it’s ever stolen, preventing unauthorized access to them, prevents people from changing your password and signing in without you giving them access to.
On some Macs, this may cause the Mac to be very slow to boot or sign in. If this is the problem your Mac is having, go to the System Preferences window, click the “Security & Privacy” icon, click the “FileVault” heading, and turn FileVault disk encryption off.
We recommend leaving FileVault enabled unless your Mac takes a very long time to boot or sign in.
Speed Up the Finder
When you launch the Finder window to view your files, it opens to an “All My Files” view by default. If you have so many files on your Mac, this view might make it run slow, slowing FInder down every time you open a new Finder window.
You can stop this by clicking the “Finder” menu and selecting “Preferences” in Finder. Select your preferred folder under “New Finder Windows Show” — for example, you can have all Finder windows automatically open to your Downloads folder. Finder won’t load the All My Files view anymore.
Free Up Disk Space
This apply to any computer, freeing up disk space can also speed it up if you have a very small amount of disk space. To check, click the Apple menu, select “About This Mac,” and look under the “Storage” heading.
If there isn’t much space, you’ll want to free up space on your Mac’s internal storage.
Reset Your System Management Controller to Fix All Sorts of Problems
This tip can fix a wide variety of system problems on a Mac, although many people wouldn’t think to try this. Resetting the System Management Controller can stop it from slow performance to startup issues and Wi-Fi hardware problems. This won’t actually erase any data.
Reinstall Mac OS X
If all the tips above fails, try reinstalling your operating system. This is a good tip every device.
Be sure you have backups of your important stuff, you can reinstall Mac OS X on your Mac. This is easier on Mac than reinstalling Windows. You can just boot into a special recovery mode, start the installation, and your Mac will download everything it needs from Apple. But you will definitely want backups of your important files before you reinstall.