The distributors, make sure they are equal/more than the belt speed for max efficiency

I'm constantly upgrading belts, distributors and tunnels, but HUB receiving 20/s and that's it.

Maybe try compact combiners (forgot the name, havent played in so long)

@WhoGotVectored You got the name one- *chrome extension shows updates*

You got the name one word off. The name is compact merger.