Open Terminal (via Spotlight search or utilities).Therefore, there is a very simple solution for activating and deactivating the command: entering a single command line in the terminal. With “Trimforce”, Apple provides an in-house command in the macOS operating system to activate TRIM on the Mac SSD - even if it comes from a third-party manufacturer. Activate TRIM command under macOS: Here's how! There shouldn't be any errors and the TRIM activation shouldn't have a negative effect on the memory, your files or the Mac itself - you can still be prepared for surprises if you back up your data beforehand ) With this link you can find “Carbon Copy Cloner” and “SuperDuper!” in comparison.

Since the activation of the TRIM command changes the communication of the internal memory management of the Mac and the memory management itself is reorganized (explanation see below), a backup before the procedure cannot hurt. Sir Apfelot recommendation: Clean up your Mac hard drive with CleanMyMac Before running: make a backup

Enable trim mac os high sierra