Not sure about the automatic trigger, but looking from prior-art about how it would work:
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Staff can trigger slow mode from the wrench menu.
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New Site Settings:
- Slow Mode Interval: Minimum time between posts from the same user in slow mode topics.
- Min Trust to Slow Mode Immunity: Minimum Trust Level for Slow Mode Immunity.
Regarding automatic triggers, we could:
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Check for posts rate in a topic during the last interval (day/hour, etc). Eg: If a topic has more than 50 posts an hour, or 100 topics per day, trigger slow mode for next 24h.
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Not sure flags are correct here, the discussion is lawful, just too fast so it excludes most of community who aren’t online here right now from participating.