Chosen Solution
My Macbook is much slower after upgrading to an SSD and performing a clean install. Troubleshooting tips I have conducted: Swapped back the original hard drive which confirmed that the cable is alrightUpdated firmware to the latest available versionFrom recovery mode set the SSD as default startup diskReset NVRAM To compound matters, the SSD seems to perform as expected when connected externally using USB. I am well and truly stumped at this point. Edit: For the sake of clarification, when I swap in the stock HDD it’s faster than the SSD. When I plug the SSD to a USB port and boot, the difference in performance is significantly noticeable.
