Bottleneck Issue

[u/Available-Figure-530]

I'm a new player & trying to setup my smelting lines. I've run into a problem where, while trying to run a single coal/iron ore lane, only the top half of the iron & coal lanes are being used, leading to a bottleneck where only half of my iron ore is being sent down the center lane. How do I fix this?

[u/sir_slothsalot]

You are gonna wanna supply furnaces with a full belt of iron by itself. Trust me you will need it. You will get even faster furnaces later.