Probe Factories produce 0.75 each tick.
From the round of August 2024, a probe production slowdown mechanism is in place to slow down probe bombs.
TLDR: If you are above 20 probes / land, you will start producing probes at a slower rate.

What this mechanism does is slow down the production of probes once probes per land reach 20 probes per land.
20 Probes per land is already a very high number, above max probe defense and above max mining gold. A high probes kingdom will not at all feel the impact of this change.
This change will help curb probe griefers, although it does not fully solve the problem.

The decrease factor is calculated as per the below:
def probe_production_slowdown_factor(probes_per_land: float) -> float:
TARGET_PROBES_PER_LAND = 20
MAX_DECREASE_FACTOR = 0.75
decrease_factor: float = (probes_per_land - TARGET_PROBES_PER_LAND)**2 / 500
return min(decrease_factor, MAX_DECREASE_FACTOR)