Each Rebirth Token trades current factory funds for a permanent upgrade. The optimal first perk is Super Researcher, followed by Farm and Mine Boost, then Ice and Water Upgrader.
Super Researcher is the mathematically optimal first rebirth perk. It grants a free starting Data Chip, which removes the $32M sixth-chip cost and cuts cumulative research spend by roughly 50%.
Farm and Mine Boost adds +1 growth point to every active farm and mine node. It pairs with the Button Presser NPC to fully automate raw material flow.
Ice and Water Upgrader is the third perk and the cleanest pure-cash boost. The greenish-teal upgrader it spawns sits next to the melting line and adds a permanent cash modifier to processed blocks.
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