World chunk generation/rendering is slow and extremely laggy at times.

When ever I make a new world it takes a minute to load the chunks in front of my character. The old world gen speeds were manageable but now it's taking the biscuit in some circumstances it can be rendered unplayable. May I also add that the entity render distance is extremely low now. This bug is also making the game very laggy as the tablet try's it's hardest to render the chunks faster but the game is bottlenecking this.