Dragon's breath causes a lot of lag

A lag when the dragon casts several blasts of the dragon.
When there are many Dragon Balls next to each other, the fps of the game is only 2 to 4, this happens when I go to face the dragon in the end, he casts so many bumps that my game is so slow that I can not even walk. Samsung galaxy j3. 1.5GB of RAM. This also happens when more than 4 dragon-breathing potions are played. Samsung galaxy j3Dragon's breath causes a lot of lag