Not sure if anybody was aware but the laggy performance in KitKat was fixed in CM commits earlier this month. I didn't see a lot of people talking about it but it definitely fixes the only real big issue remaining with KitKat on the Razr M. Nobody has done a recent CM build that has these commits but if you Google "arrrghhh's kernel" you will find a kernel that has the relevant updates.
arrrghhh's kernel -
