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It does sound sound positive, but it's a curse.

I don't have any evidence, but it does feel like there's some algorithm at play which devalues posts with an attack of upvotes within 1 minute! I have seen a couple of great posts get lost in the void because of this effect too.

You're right. There're actually certain algorithms at play which devaluate any up-votes within 20 MINUTES, believe it or not.

I have noticed that too. It seems tied to the 30 minute penalty for curation rewards.