Minecraft on my smartphone lags before I have updated it to 1.16

Sometimes game lags, and nor restart the world and a game, nor reconnect to wi-fi doesn't help. Sounds, block installation are lag behind, droped items fall dawn and instantly teleport back up, so if you stay nearby them, they will pick up more later, mobs lags too: they move short jerks and if you hit they will cast off and even get stuck into the air. All this started after I instal the update on the world, which was created in 1.14.60