Stiven

I can still play in the world if I close the game and open it again

do not believe I tried that too, I created a new world and keep going lag, in single player it is perfect, I think it is something of the update ;(   because before 1.16 came out the realm was perfect!

Yes, I have done all that, but it continues to be very lag since the new version 1.16, the realm is are soo lag and unplayable.

I have no idea what could be more maybe is a programming problems or i don't now what!