Server lag after Waterlogged updated

Before update Waterlogged, there's no problem how many players in my server.

but after update, i can't play the game because of server lag when other players join my server.

My network is fine

When my brother opens server in same network with mine, it works fine.

Only my server is in trouble.

I already tried reinstalling game twice, opening new world and deleting Mods. 

Please answer me

I don't want to make KLEI to hurry fixing bugs.

I just want to listen what it problem.