A mods that disables placement of belts completely. You can't place undergrounds, splitters or normal belts of any kind, instead you need to adapt to make all of your designs bot-based.
Belts are still available in the form of items, but those are useless except for logistic science packs, where their purpose remains.
Robots and corresponding technologies are mostly researched when the game starts. To make your base a bit faster, technology to increase robot carry size and speed is also available from the start.

Performance Impact

The performance impact of this mod isn't zero, which is why this table of orientation was created for whoever wants to play the mod.
Note: The save that was run as a benchmark included 100k logistic robots picking up and dropping off items from one place to another place (about 20 tiles wide). Looking at bots means looking and rendering all of the bots on your screen. This said, you would encounter much better results in your average playthrough.