- You can unlock it in Hub at Tier 5.
The Item Throttle controls how many Items per minute should pass over a Conveyor Belt.
The Overflow Toggle prevent the overflow on the Conveyor Belt. You can connect it with the Item Throttle.
Copy "SlowItdown.pak" and "SlowItdown.sig" to SatisfactoryEarlyAccess\FactoryGame\Content\Paks