I had been experiencing lag near my base for quite a while. I made a creative copy of the world and after much trial and error I was able to eliminate the lag after killing all the horses (about 7 horses only).

I don’t know how to upload a copy of the world to this report from my Xbox, but am happy to provide it if needed.

I tried finding a similar bug to upvote but couldn’t find one.

I have been having this problem since before 1.14.60 hotfix.