scrolling problem in conversations? low fps.

hi. i don't know if how did i actually have this problem or maybe everybody has the same.
it is with my messaging. when opening a conversation ( received and sent items ) with a lot of messages to scroll up and down, it is not smooth.
when i scroll down or up a conversation, it is just slow and lags very much. it's like the fps dropped.
i have to enable 2d acceleration to make it smooth and better fps.
i experienced this only in conversations.
i already did a full wipe before flashing again and still the problem is here
I do not know if it is like this already or this just happened after watching an mkv video through BSPlayer.
I'm currently using stock 4.1.2 Poland ROM.

do you guys experience this as well???
please help me.