Default [Q] Galaxy S II TRIM

Hello everyone.
As you know, or not, our phone has very slow flash memory. I would love to use trim, but they said trim is bricking our devices.
I saw some users who did it and said 'it's safe on custom roms above android 4.1 coz they fix something with memory', is it true? Is there someone who actually did a trim and get decent results?

Ah, btw. im using clean cm10.1(kitkat has too much bugs and is laggy for now) with dorimanx kernel. Unfortunately i have insane chip but phone passed memory test from eMMC Brickbug check.

DAAAMN, wrong place. Can some admin delete or move it?