This is the best way to reduce lag on Pubg mobile (Lightspeed Version) using Samsung Game Tuner app that works on any samsung devices like J1,J2,J5,J7. Other low spec devices might work if you can try to download it.
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Samsung Game Tuner: https://apkpure.com/game-tuner/com.samsung.android.gametuner.thin
Pubg Mobile : Taptap.com
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My device: Samsung J5 2016
Songs: Erik Lund - Summertime (Vlog No Copyright Music)https://youtu.be/E338aF6QHu8