Infinite research breakpoints

While infinite research technologies can be leveled forever, there are certain breakpoints that provide a notable benefit by reaching a practical cap or greatly conserving resources. These may be important factory goals.

Productivity

Technology	Interesting breakpoints
Processing unit productivity	Level 13: Electromagnetic plant filled with legendary productivity modules reaches the 300% productivity cap. Level 25: Electromagnetic plant reaches the 300% productivity cap with no modules.
Low density structure productivity	Level 15: Foundry filled with legendary productivity modules reaches the 300% productivity cap. Level 25: Foundry reaches the 300% productivity cap with no modules.
Steel plate productivity	Level 15: Foundry filled with legendary productivity modules reaches the 300% productivity cap. Level 25: Foundry reaches the 300% productivity cap with no modules.
Plastic bar productivity	Level 10: Cryogenic plant filled with legendary productivity modules reaches the +300% productivity cap. Level 15: Biochamber filled with legendary productivity modules reaches the +300% productivity cap. Level 25: Biochamber reaches the +300% productivity cap with no modules. Level 30: Cryogenic plant reaches the +300% productivity cap with no modules.
Rocket fuel productivity	Level 10: Cryogenic plant filled with legendary productivity modules reaches the +300% productivity cap. Level 15: Biochamber filled with legendary productivity modules reaches the +300% productivity cap. Level 25: Biochamber reaches the +300% productivity cap with no modules. Level 30: Cryogenic plant reaches the +300% productivity cap with no modules.
Rocket part productivity	Level 20: Rocket silo filled with legendary productivity modules reaches the +300% productivity cap. Level 30: Rocket silo reaches the +300% productivity cap with no modules.
Mining productivity	Level 50: Big mining drills mining scrap saturate one side of a turbo belt. Level 110: Big mining drills mining scrap saturate an entire turbo belt.

Combat

Technology	Interesting breakpoints
Physical projectile damage	Level 1: Gun turrets loaded with firearm magazines kill basic biters in 3 shots instead of 4; greatly conserves iron plates.
Stronger explosives	Level 2: Grenades destroy trees in one hit. Level 8: Rocket (yellow) destroy medium asteroids in one hit; greatly conserves rockets. Level 12: Rocket (yellow) destroy large asteroids in two hits; greatly conserves rockets. Level 16: Explosive rockets (red) destroy large asteroids in two hits with direct damage; greatly conserves rockets.
Laser weapons damage	Level 11: Laser turrets destroy small asteroids in one damage cycle.
Railgun damage	Level 2: Railguns destroy all asteroid sizes in one shot; conserves ammo.
Artillery shell damage	Level 9: Artillery shells defeat Nauvis spawners and Behemoth worms in one hit; conserves shells.