If you are experiencing slowness in using your Apple Mac, then try speeding up its performance with these steps. Please perform these actions only if you are comfortable with running system utilities.
Check disk errors
This step should be done from the Recovery Partition. This will help you in verifying your disk/hard drive issues but you cannot fix them. If you see some critical alerts then you should go and buy a new hard drive, take backup of your data and get your mac re-installed.
Check and install updates
The first thing you should do is to make sure you have all the latest patches, security updates, and application updates available via Software Update. If you're running an old version of Mac OS then upgrade to the latest version. If the new version is not supported on your hardware, it's worth using Software Update to make sure your system is as up to date as it can be.
Uninstall Unnecessary Apps
After the update process is complete, check all your installed Applications folder and start uninstalling programs that you know you no longer need. Uninstalling a Mac app is simple, just drag the app to the trash, but this can leave orphaned preferences files from those uninstalled apps on your computer. You can use various app unistallers available for free to remove those unwanted programs from your system. Finally, go to System Preferences, click on Accounts, and clean out the Login Items tab of any applications that you don't want to run on startup.
Optimize Your System
Go to Disk Utility and click "Verify Disk." It shouldn't take too much time, and if you see any errors, wait for it to finish and click "Repair Disk." It's always recommended to verify your disk every few months, just to ensure you're not missing some issue with your hard drive or your OS X installation. You may also notice that you can verify or repair disk permissions. Apple still recommends repairing permissions for specific issues and references it in its knowledgebase.
Remove startup items
It is highly recommended to remove unneeded startup items. Click the apple, go to System Preferences, and click on Accounts. Go to the Login Items tab, and deselect any applications that you don’t want to launch every time you login.
Turn off sharing
If you are not networking between multiple computers, turn off Sharing under Internet and Network in System Preferences.
Turn off widgets
Click F12, and uncheck any widgets you don’t regularly use.
Run activity monitor
Check what programs are running by opening your activity monitor in the utilities folder. Turn off any you aren’t using.
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