Im not aboslutely sure if this is is named a bug but when i look at java version a hopper pushes 1 item and the other sucks 1. but in Win 10 the hopper sucks and sucks until the hopper in front it empty. And just AFTER that the next hopper starts to suck the items. so with just 5 hoppers in a row and 5 stacks different items it takes a very long time.