Siralim ultimate - sever lag in overworld and in long battles

As the title states I’ve been experiencing severe lag in the game on android. In long battles the speed slows down to a crawl sometimes. When the performance mode is toggled on, it becomes worse.

Any methods to overcome this? It might be due to the number of minions, also I’ve put in about 20 hours in the save file with around 500 decorations.

Device - pocof1
Snapdragon 845
Ram - 6gb