Hello, when I turn up my macbook it start lagging  a lot and also when it is turning off while I use it it works perfectly

Hello, when I turn up my macbook it start lagging  a lot and also when it is turning off while I use it it works perfectly anyone help

Not enough free storage space can slow your Mac down. Click your Apple menu icon top left in your screen. From the drop down menu click About This Mac > More Info > Storage. Make sure there's at least 15% free disk space.
Anti virus software, as well as third party Mac cleaning utilities such as MacKeeper  and CleanMyMac can also slow your Mac down.
Check to see if the startup disk needs repairing.
Launch Disk Utility located in HD > Applications > Utillities
Select the startup disk on the left then select the First Aid tab.
Click:  Verify Disk  (not Verify Disk Permissions)
If DU reports errors, restart your Mac while holding down the Command + R keys. From there you should be able to access the built in utilities in OS X Recovery to repair the startup disk.
Make sure to back up all important data first before using OS X Recovery.

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