Help with optimizing.

On some acts, such as "Dungeon" or "Defend Grenichen" i have low fps. This issue appears only on certain acts, not on all stages increasingly: for example, i noticed, that "Ancient forest" goes smoother, than previous stage. I performed optimizing by side apps, such as "GLTools", "Seeder", "App override", plus changed some device settings for better performance. But it is not enough. "Dungeon" keeps lagging, though not as much, as without my actions. So help me with fixing it. Suggest your ways, try to find new. Further this topic may become one of the most important, cause lags are main problem for many users.