Something very peculiar is happening with the purple and green equipment.

https://i.imgur.com/xaPkG9V.png

As you can see, the input is fully saturated, but the output has gaps. What's strange is that I can't identify why. In both cases, the belts and loaders have the exact same speed. When I ride the belts, I see no slip, so it is flowing into the loader at top speed.

Additionally, the beltbox itself is processing at full speed without backup accumulating. In fact, if I take a stack of coal in this example and drop it into the packing beltbox, it will saturate the output line while slowly chipping away at the stack I dropped in until it is gone and then there are gaps again.

What do you suppose is happening here? It acts almost as if items are getting deleted when passing through the first loader.

That's interesting - it seems like the beltboxes aren't quite keeping up with the speed of the belts, despite being based on the same math. I'll take a closer look.

Huh - checking with green beltboxes here and they seem to be exactly on pace with the belts at 75 items per second. Maybe some other mod interacting or something else odd going on, can you post an example save?

Sure, here you go

https://www.asuswebstorage.com/navigate/a/#/s/7CACD7C1E13441FD989580D52CCB0DC94

I disabled all my mods except Bob's, Deadlock, and Creative. Really simple setup.

It looks like the issue is actually with the matter sources - they're only making one item per tick, so there are gaps on the input belt. Switching to infinity chests from the map editor is getting gap-free output on the green belts :)

Why is the source belt fully saturated then?
I knew that the matter void was not deleting items fast enough for the green belt. This is why I had a splitter on the output side, which is something I hope the Creative mod maker will fix. But the matter source seemed to be able to fully saturate the source belt.

[edit] oh hold on. Is that source belt actually NOT fully saturated even though it appears to be? Maybe the items are just spaced ever so slightly apart.

The source belt isn't fully saturated, there are small gaps, they're just very hard to see. https://i.imgur.com/yyH0RjB.jpg