Lag. Low/choppy frame rates

Hi minecraft devs  

So i play minecraft on multiple devices 

All on the mcpe  edition. 

Heres my bug. Before 1.16 update I could play on my Samsung note 10+ 5g at a 40chunk render distnance and get 60fps ( during shall I say normal running around) would lower when flying with elytra or operating a big mob farm) 

Now since 1.16 I'm getting almost 5 frames per second chunks arent rendering mobs armt moving 

I turn my render distance down to my minimum of 12 

Its slightly better but as soon  as i load a new chunk. 

I completely drop frames again as it trys to process the new chunk . 

I have a high end phone.  Faster than the consoles. So why am I having issues on mobile.  But not on either my xbox or my pc. ( all on the same sever ) I also tried  it on a realm and it was also the same issue altho sightly  better as max render distance is somthing like 10 in a realm 

I've attached photos