In my opinion, SSD drives have a problem because of an assumption in File Systems.
When a file is deleted with traditional rotating drives, only the directory entry is cleared, and the actual data blocks are simply added to the free pool to be re-used later. Re-use merely overwrites entire blocks (no read-modify-write involved). Simple, effective, and FAST.
An SSD cannot write anything but a completely empty block, and its internal blocks are HUGE. To re-write a (partial) superblock, it must read-erase-modify-write, a very slow procedure.
But no general-purpose notification is sent to the drive that the "un-needed" data blocks should be considered "deleted". This works fine for a rotating drive that will later simply overwrite deleted blocks. But lacking a notification of what blocks are "deleted", the SSD continues to carry ALL those "deleted" blocks as if they were good data. This clogs it up, and performance on many SSD drives goes way down.
Apple-certified SSD drives use TRIM to notify the SSD which blocks have been deleted. But Apple routines do not send these commands to non-Apple-tested drives, as Apple has not tested these.
TRIM Enabler from groths makes a patch to enable TRIM for any SSD that claims to support it. This may cause unintended consequences on certain drives. No one knows for sure. I use it and have had no issues with it. Use it at your own risk.
If you choose to use it:
Install the Utility.
Run the Utility and enable TRIM for each drive you want.
Restart.
Run Disk Utility ( Repair Disk ). If all is well, you will get an additional message: "TRIM-ing unused blocks"
