exynos 850 in a21s is not a very capable chipset, only thing u can do is to reduce quality and franerate feom in game settings to prevent frame drops....a better internet connection will also help
Kindly be informed Pubg is a 3rd party application which is not from Samsung. As we are trained to handle Samsung software and hardware related troubleshooting, we advise you to contact to the respective application software support. You can reach to the app developer through email channel go to: Play store > select more option> select installed app> click on read more.
You can try after clearing the app cache by following below steps: Go to settings > Apps > More option > Show system apps > Select the application > Storage > Clear cache.
