Hello  

So, I created a new world for the nether update to play with two more people, and at first it went well, but like two weeks ago it started to lag at times but then it would go back to normal, however, now every time someone enters the game it lags so badly that it is impossible to play. 

We have other worlds as well, and we don't have this problem when playing in any of them. We even tried exploding lots of TNT and going thousands of blocks away from the spawn point to see what happened and my other world didn't experience any lag. So I'm certain that the problem is just in this new world.

-I'm the host and it's not a realm, it's just a LAN connection.

-My internet shouldn't be the issue as I work with 20 Mbps.

-16 GB RAM.

-It's a creative world. 

-The seed is -513070979

-Right after creating the world, we moved around 500,000 blocks from the spawn point using commands and set a new spawn point.

-We don't have any resource packs, add on, or anything applied to this world.

-We barely have any redstone knowledge, so we don't have big machines or anything.

-Link to the world: https://drive.google.com/file/d/12Igp3t40p_TJlpQMpLnZGp0VYNX-M6K1/view?usp=sharing

I wasn't really sure of what information to add, because I've seen a lot of the lag problems being "resolved" as invalid because of apparently insufficient information, so I've tried to put everything and I also exported the world just in case, so please let me know if there's something else you might need in order to fix this. Also, I searched for other tickets with the exact same problem but I didn't find one.

Thanks for your help and have a nice day