I've been working on building and testing a private ethereum network using geth and commodity AWS hardware. I'm curious if it's realistic to expect 14s block times in this case? What I see is very fast block times at the beginning of a new chain, but then it slows to around 21s block times within the first 20,000 blocks.

  • Just digging up this old thread: Have you made/Did you make any code changes in Geth? Feb 16, 2017 at 14:35

1 Answer 1


This turned out to be a resource problem. Once I allowed geth to use multiple minerthreads, the block times hit a more typical average of around 14-15 seconds.


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