What is TRIM?
TRIM is a technology that allows to improve the speed of data logging tasks currently only available on the SSD. The SSD supports TRIM enables improved write speeds than conventional SSDs, especially when compared to mechanical hard drives.
How to enable Trim in Mac OS X El Capitan, Yosemite, Maverick,..?
Download Trim Enabler 3.4 Full version here.
Step 1: Install and activate Trim Enabler 3.4 with license key.
Step 2: Restart your Mac
Step 3: Launch Trim Enabler 3.4. Select ON to Enable Trim
Step 4: Launch Terminal, then enter the following command line.
sudo kextcache -m /System/Library/Caches/com.apple.kext.caches/Startup/Extensions.mkext /System/Library/Extensions
Step 5: Restart your Mac.