MacBook super slow on startup after SSD upgrade - MacBook Pro 13" Retina Display Early 2015 - iFixit
Very slow boot time(about 1 min) after upgrading to NVME SSD, turning TRIM on/off didn't help | MacRumors Forums
SOLVED: MBP extremely slow after SSD Upgrade. What's wrong with my mac? - MacBook Pro 15" Unibody 2.53 GHz Mid 2009 - iFixit
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