Factorio Forums

Posted: **Sun Aug 03, 2025 11:14 am**

In 1.1 we could saturate a blue belt with 3 inserters if 1 of them was targeting a perpendicular splitter:

In 2.0 this behavior was unintentionally nerfed. Now 2 splitters are needed to saturate a blue belt:
https://www.reddit.com/r/factorio/comme ... ges_in_sa/

The old numbers had it at 18.9 (splitter) + 13.85 (belt) + 13.85 (belt) which sums to 46.6 I/s. Which was enough to have a fully saturated blue belt with 1 splitter. Now 16 (splitter) + 14.4 (belt) + 14.4 (belt) sums to 44.8 which is just short of that. ... The only way to break the 45 I/s throughout with non quality bulk inserter so far is to have the full throughput of two splitters 16 + 16 + 14.4 which is 46.4, still less than the amount with 1 splitter and 2 belts before.

This nerf particularly impacts high-throughput train unloading stations. These are designed to unload 4 blue belts per train wagon in a relatively UPS-efficient way:

The reduction in throughput from 1.1 to 2.0 broke most of these designs and made it much harder to find alternatives. After much

searching, I was able to find 3 that still work:

But these are less UPS-efficient and require more space. They use more splitters, more inserters, and/or car handoff.

When the reduction in throughput was reported as a bug, Boskid explained that this was a result of a bugfix, and he stated the old throughput was not sufficiently "expected behavior" to be considered a bug and to post a suggestion thread if we want it reverted.

So here I am: It was expected behavior and this broke our designs. We were using it for train stations, and among other things. I don't like how we have fewer options that are a worse overall, and I would like to see inserter-to-splitter throughput restored to 1.1 speeds.

Posted: **Sun Aug 03, 2025 12:22 pm**

Sorry but no. The old behavior was a bug in the implementation and is not going to be reintroduced just because people want it to be bugged.

Posted: **Tue May 26, 2026 2:08 pm**

For loading splitters/belts from mining drills, there is a workaround with circuit conditions:
https://www.reddit.com/r/factorio/comme ... ing_drills

Add a belt before the splitter (which is being loaded by the miner) and connect it to the miner. Set the belt to read all belts, and disable the miner if the signal is above 4.

Factorio Forums

Restore inserter-to-splitter item throughput to 1.1 speeds

Restore inserter-to-splitter item throughput to 1.1 speeds

Re: Restore inserter-to-splitter item throughput to 1.1 speeds

Re: Restore inserter-to-splitter item throughput to 1.1 speeds