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Here's what trim support is supposed to do for you:
"TRIM essentially goes through the file records and frees up blocks that you’ve deleted by telling the controller to stop keeping track of them."
And here's why it might not be working for you:
"If you’re using a device that was running a down-level version of Android and you upgraded it to version 4.3, you probably want to do a factory reset to regain your lost speed, though you shouldn’t notice any further slowdowns if you opt not to start from scratch."