Belt throughput possible bug?

[TheCaptain]

Hi, I'm new here. Not a pro player by all means, and maybe I'm missing something but...
Shouldn't this work?

Captura de tela 2025-05-22 143424.png (3.97 MiB) Viewed 160 times

Explanation:
- I'm trying to produce 9.12 blue circuits, which is consuming 96 green circuits. I am also producing exactly 96 green circuits. A turbo belt has a speed of 60 items a second on each lane, which amounts to 120 items on both lanes, right? Then why isn't my blue circuit factory not consuming all of it?
- I've tried one single belt of green circuits going around the blue circuits factory and then a splitter, but none of them worked. Around half my factory of blue circuits remains inactive, and on this image:

Captura de tela 2025-05-22 143424.png (3.97 MiB) Viewed 160 times

those first three machines aren't putting any items on the belt, like if the belt is full. But if I'm producing 96 green circuits(48 each side of belt) then the turbo belt shouldn't be full on either side, right?

[Tertius]

A turbo belt has a speed of 60 items a second on each lane, which amounts to 120 items on both lanes, right?

That's not correct. The 60/s of a turbo belt is for the whole belt. Each lane is 30/s, both lanes are 60/s.

If you use stack inserters, you're able to use stacks of 4 items, so you get 4 times this throughput since it's then 60 stacks/s, so you get 4 * 60 = 240/s as absolute maximum of the turbo belt. Stack inserters are from Gleba.

With throughput that high, consider a setup with direct insertion. At least for the green circuits. I didn't design a blue circuit factory with electromagnetic plants yet, but with regular assemblers it was possible to use 4 machines in a trapezoid pattern. 1 machine for copper cable feeding both the green circuit and red circuit machine, the green circuit machine feeding both the red circuit and blue circuit machine and the red circuit machine feeding the blue circuit machine. Balance output with beacons with speed modules and use productivity modules everywhere.

[its a me]

I think that the issue is that the blue circuits take more green circuits than the red circuits, so you need to give the blue circuits more than one belt and the red circuits less than one.