Realm lag when more player join

Hi,

So me and my friend have been playing realm for like the past 1-2 months which start from version (1.13) we were having no issue at the time everything is running smooth. After the update on 1.14 & 1.14.1 the realm start to get laggy whenever there 2 or more player online. When we are on alone we don't lag at all.

(For whatever reason i can't choose the affected version as 1.14.1)