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@potch @KevinMarks @anildash @lmorchard In general, the pollers have to optimize polling frequency. Most polls will be no-ops -- no changes. All servers that get polled have to manage thousands and millions of no-op requests per day. There isn't much penalty for polling more often than needed, except that it's hard to scale. But for small implementers without a lot of readers, pounding a feed every few minutes doesn't have a lot of consequences.