Frame drop issues on newphone

[Knightdroid250]

So my brother and I have the same smartphone(oppo realme 3)and my brothers phone is only 1 moth older compared to mine and i bought this only last month brand new.and im having this issue where when I play mobile legends the game lags horribly compared to my brothers phone which he gets a smooth experience.we also have the same firmware version.I also dont use background extensive app like facebook unlike my brother but he still gets smoother gameplay than me.what seems to be the problem?pls help, Thanks

[Shinon214]

different chipset there's two chipset for this phone Mediatek MT6771 Helio P60 & Mediatek Helio P70. more info link below.
https://www.gsmarena.com/mediatek_unveils_helio_p70_a_faster_version_of_the_p60-news-33871.php
in game settings of Mobile Legends
GFX Tool
CPU throttling Heat due to Case

else let them replace that phone ASAP, tell them that you have issue with its performance and compared it with the same exact model.
it should be covered in warranty since its not physically damaged.