Macbook air early 2015 model suddenly become very slow
My Macbook air suddenly became very slow...what to do?
MacBook Air 13″, macOS 10.13
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Try booting into Safe mode then rebooting normally How to use safe mode on your Mac - Apple Support
Reset the SMC How to reset the SMC of your Mac - Apple Support
and NVRAM Reset NVRAM or PRAM on your Mac - Apple Support
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