I aggregate some chest to chest connections with several belts and mostly only one belt ist filled to the brim, while the others are only in use sporadically.

The sending router is filled by several inputs and runs into state of "overflow items", when those get 0 some requests are spread also to other belts, but it seems only one slot at a time, so the router will be filled again till overflow, so at the moment it doesn't scale well using parallel belts.

Can you send me the saved game ? . I would like to analyze.

i try to reproduce the situation in a smaller setup, since more than 200 mods, some of them are not on the portal available, would be too much.

Thanks i think i have a solution, but i need to check. As a partial solution, you can increase the output buffer of the provider node;

i tried that already but it did not help, the problem got worse, since it took longer to leave the overflow state