Since the 1.13 update the game on android started lagging a lot. Whenever going close to the ocean it will start lagging a lot. So I knew that it was the Aquatic update. But probably the Nether update as well. The only easiest way is to turn down the graphics but I didn't want to. So please fix the performance on android I've been trying to fix it but it's still very laggy. I did find some ways of reducing lag like turning off Vsync by editing options.txt. But the tricks that worked only reduced the lag by only a bit. Turning the chunks to the minimum works but didn't want to do that since I won't see far. There we're other ways like getting a game booster but most doesn't work. I use one but reduces the lag only a little by cleaning ram in the background. So please fix this.