To be honest with you..the stock where I "down graded"..it is very very very fast almost zero, zero zero zero zero one lag..it takes about 20 seconds to boot up (that says a lot about the rom)..so I don't think I need to be in custom..
Maybe it has to do with your T3 version but if your happy with the stock rom then you have no need for custom roms.
My mom-rooted stock rom also takes 20 seconds to boot. My rooted deodexed zipalined custom stock rom with the Xposed framwork and modules takes 27 seconds to boot.
Athough the Snapdragon N4 advertise 2.7GHz in reality it 2.688 GHz and only 2 of the 4 cores are fully operational. My custom kernel is overclocked at 2.899GHz and set to 4 cores running consistently. Compare 2 cores at 2.688MHz to 4 cores at 2.899MHz and see who out performs after boot (that;says alot about a rom).
Try downloading kernel Adiutor and check it out for yourself.
Yes I said a lot of restrictions and asks for a lot of permists..that I ain't got time to be granted for