high cpu usage caused by trade llama

BDS : 1.16.201

os: ubuntu 18.4

ram: 16g

cpu: intel j5005

tick :  sim 6/ view 16

 

client:  android 9/snap 845/6g ram

tick :  sim 6/ view 16

 

trade llamas arround my world causes high cpu usage.

i tp them to me (on land near worldspawn) and cpu usage drops to bottom.

then I tried to narrow down the cause by killing them one by one and I found

this weird thing.

when I try to get close to these two llamas on the ocean, the cpu usage drops according to the distance from them. 

If I get close to them cpu usage drops to normal.

If I go far away then cpu usage peaks to top. ( well actually only one out of 4 cpu peaks to the top)

 

additional info:

command shows 19 of these llamas. and those are all within r=100.

and quite alot of those are in caves where I have never been. the rest are on the ocean. 

the attached pics doesnt show much but each distance difference gets high / mid / low cpu usages.

I re-tested it with fresh backup having all 19 llamas. and shows same result.