Here are some Redstone farms we found to help players be lag efficient on the server, while you don't have to use these designs go ahead and take a look at!

Lag Efficient Wool Farm

Lag Friendly Sugar Cane Farm

Lag Busting Bee Farms

Lagless Item Sorting System

Villager Breeder Tutorial (works in Java)

To get this breeder to work place the beds like this.