There are lags for all actions such as mobs, block place/break, combine units.
When Realm was created, the lag was deep and played for 5 months, but the more updated, the worse the lag became.
So I canceled my Realm subscription because I can't play realm server.

Please fix!
Realm issues aren't being resolved for all players.

This video will help understand the problem.
https://youtu.be/m1-0V39MvIE?t=105