What can I do to make the game run smoothly when it lags?

Close all processes and restart your device. Check your battery level. On some phones, processor frequency will be lowered when the battery level is low. This may result in lower frame rate and game lags. Consider charging the phone till sufficient batter level, then experience the game. Check the temperature of your phone. On some phones, temperature control will lower the processor frequency when the temperature is too high. This may result in lower frame rate and game lags. In particular, playing while charging could make your phone really hot and reduce frame rate. Consider pausing the charging temporarily to lower the temperature. Check your connection signal. The network latency icon is on the top left corner. A yellow or red color indicates poor connection. Consider changing to WIFI or 4G network. Consider reducing the graphics quality, turning off styles or features such as anti-aliasing, instead of just increasing the frame rate setting.