Proximity lag with other players on Realms.

For about 3 weeks now my group of friends have recently reopened a Realm for us to play on. Now at first we thought everyone was causing proximity lag with each other. (Proximity lag being walking withing render distance or roughly like a 30 or 40 block distance of each other). Now we have determined that it is mainly. Only my character/account that causes the lag and makes playing mini games on our realm or adventuring together without me standing within that 30 or 40 blocks miserable for my other friends. Now when we played on the realm last year all together we ran with no proximity lag issues. Please help.