Default [REQ] port conversation of z1 to z 4.4

hi can anyone port the new z2 conversation to our z/zl? kitkat version

because the conversation that we got from kitkat has a lag when scrolling specially when it has a lot of message
but when i try the old z2 conversation posted by niaboc (but its only for 4.3) it has no lag but the problem is i can't delete message event i clear and restarted the phone