![Neutral :|](./images/smilies/icon_neutral.gif)
Okay, this is maybe not strictly about a bug but just simply optimizing potential, but maybe it is.
All around are passive belts (those with the red circles) but there are some belts that are doing nothing but are active (no red circle) while they could be set to passive.
![Image](https://forums.factorio.com/images/ext/904e90ea271cde5689b0c6d87d9b9a95.jpg)
^^^ There are also some in the lower left corner.