It's lagging Vibrant Visual on Andreno820 snapdragon 8 gen 5

I have an android phone with a snapdragon 8 gEn 5 3.8 GHz processor (adreno 829 GPU) And when running minecraft with bright visual effects on low settings with low screen resolution, I have unstable fps, that is, it drops from 60 to 20 and lags When I drag items in the Inventory. My phone is suitable for these graphics settings, but the game needs to be optimized.