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I think, there is queue for block addition it looks (15 blocks behind or so). If @furion can clarify exact numbers or way it is being populated, it would be helpful.

Operations and new Posts are near real time, new accounts will be too in the future. Everything else is delayed. Once work sharding is in place, it should be pretty fast.

Blocks don't always have data/transactions so this is why it isn't a constant x blocks added each x seconds i think, but yea, let's wait for @furion