Fast Splitter

Lore & Background

In the early days of a Factorio colony, a single Splitter is all you need to fork a stream of iron plates off to a furnace line. The little machine clicks along at its stately 0.5 items per second, and nobody notices. But as the factory sprawls—refineries humming, assemblers stacking into rows, rail networks threading across the map—that same click becomes a metronome of frustration. Belts back up. Items pile into the splitter's input lane like traffic on a single-lane road. The factory is alive, but it is *thirsty*, and the Splitter is the narrowest straw. The Fast Splitter arrived as the answer to that thirst. By incorporating Processing Units into its chassis, the internal mechanism shifts gears and pushes items through at 0.75 per second. It is not a revolution in kind—items still travel the same two-lane, arrow-directed path—but it is a revolution in *degree*. A junction that once held back a full belt's worth of throughput now keeps pace with the fast belts running into it. For the player, the difference is the difference between a factory that stutters and one that sings. In the broader narrative of the alien invasion that drives Factorio's story, the Fast Splitter represents the industrialist's quiet, mechanical ingenuity. There is no alien tech here, no space-age material. Just better gearing, tighter tolerances, and the stubborn human (or player) insistence that their logistics network should never, ever be the weak link.

In Their Own Story

The night shift at Junction 7 was supposed to be simple: reroute the copper-plate stream from the new smelter line into the circuit fabricator. Mara stood at the edge of the belt, watching the backlog of items crawl toward the old Splitter like a slow river meeting a dam. The assembler on the other side was idle, its mechanical arms clicking uselessly in the dark. She pulled the Fast Splitter from her inventory slot, set it down, and connected the input and output belts. The little machine hummed to life, its internal gears clicking at a noticeably quicker tempo. The backlog drained in seconds. The assembler roared back to life, arms whirring, circuits spitting out in a steady stream. Mara exhaled. Somewhere out in the dark, the alien spires pulsed their slow, indifferent light. But here, in this small rectangle of factory floor, the machines were keeping up. And for tonight, that was enough.

Reader's Guide

To craft a Fast Splitter you need 20 iron plates, 10 copper plates, 10 electronic circuits, and 5 processing units, assembled in a Crafting Machine (or by hand in Creative). The upstream chain is straightforward: iron ore → iron furnace → iron plates; copper ore → iron furnace → copper plates. Electronic circuits require iron + copper plates in a Crafting Machine. Processing Units require electronic circuits + red circuits, and red circuits in turn need iron plates + plastic (from an Oil Refinery processing light/heavy oil). The typical bottleneck in this chain is plastic production, since it depends on petroleum extraction and refinery throughput. If you are mass-producing Fast Splitters for a large logistics overhaul, ensure your oil pipeline and refinery capacity can keep up before you scale the circuit and processing-unit lines. As your factory grows, the Fast Splitter's 0.75 items/s throughput matches the 0.75 items/s rate of Fast Belts, meaning it will not create a new bottleneck at the junction. This is the key design intent: pair Fast Splitters with Fast Belts for a uniform 0.75/s pipeline. If you later upgrade to Express Belts (1.0/s), the Fast Splitter *will* become the limiting stage, and you will need to either add parallel splitters or accept a slight throughput dip at those nodes. Plan your splitter count accordingly—every junction is a potential choke point.

Did You Know?

• The Fast Splitter's 0.75 items/s throughput exactly matches the speed of Fast Belts, meaning it was designed to be the natural pairing and never create a speed mismatch at a junction.
• Unlike the regular Splitter, the Fast Splitter's recipe requires Processing Units, placing it firmly in the mid-game tech tree and gating it behind red-circuit and plastic production.
• The Fast Splitter does not change the routing logic of items—left, right, or straight-through behavior is identical to the standard Splitter; only the transfer cadence is faster.
• In large factories, a single misconfigured Fast Splitter (e.g., pointed the wrong way) can cascade a backlog across dozens of downstream assemblers, making correct orientation as critical as the speed upgrade itself.