Unhappy Heavy 2d lag on Parallel Kingdom

Seems like this a quite common problem with the new KitKat version, but I cant play 2d games on my phone without heavy graphic lag, worst is parallel kingdom wich is a game that im crazy addicted to. There is some solutions on the internet regarding this problem (hw overlay thing and the force gpu render on 2d graphic in dev settings) but nothing works.

Ive also written to the dev team behind the game but they claim that the problem is solved and they dont want to provide me with an answer.

Is there anyway I can fix this problem?
I have a Moto G Google Play edition, runs great on every 3d intense game.