Sometimes it takes an around of 25ms to import new block by the other peered node after mined by miner. But sometimes it increases directly around 400ms to import block by peered node after mined by miner. In PoA: Clique consensus there is no such delay I found.

Is this due to latency ?  
ans : No, Ideally zero latency for same machine/region  

And my question is,

  1. What is the reason for the non-uniform block receiving delay?
  • CLique consensus relies on authority in making blocks, which can't be given easily. So basically you have to wait because an other distant node has the authority to make a new block and your node doesn't. based on the above you can say that network delays, data reading, writing and processing delays can cause the mentioned effect. – Kaki Master Of Time Dec 12 '18 at 20:31

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