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I succeeded! I found this ： https://www.tonymacx86.com/threads/solved-macos-sierra-ssd-sandisk-ultra-ii-low-speed.227071/#post-1543234 https://www.howtogeek.com/222077/how-to-enable-trim-for-third-party-ssds-on-mac-os-x/ Thank!

:( I have the same problem with you, what should I do? thank! Read speed is always really good, but the write speed just 20MB/s.