Hello! We’re playing with the Space Exploration mod, and when we process Core Fragments and get the basic raw materials (stone, coal, iron, copper, uranium), the Express Miniloader becomes extremely slow when loading them into any kind of chest. It behaves as if the normal 45 items/second drops down to around 2 items/second.
As a workaround, I have to use two Fast Miniloaders instead, because those work correctly.
Version: 0.12.0

The express loaders use a hand size of 2 (the fast loaders use hand size 1). Is it possible that you move only very few core fragments at a time (and thus the express loader waits for a second to show up before moving them over)? In that case, you hit a corner case/quirk on how the miniloaders work.

If you have a save (same as the github issue), I would need a save to test.