I gave up on waiting on updates to 4.3 or KK - this last week I finally bit the bullet and flashed CROMI-x. Painful process in that it took days to be successful in unlocking the bootloader - literally took dozens of tries before the tool finally worked. After that, all else was straightforward. I wasn't having any particular performance issues; rather, I got fed up with the random reboots that seem to occur at least once/day. Hopefully, that will improve with CROMI-x.