This is normal behavior due to a special rule on testnet. For a detailed
explanation you can read
https://web.archive.org/web/20160910173004/https://blog.blocktrail.com/2015/04/in-the-darkest-depths-of-testnet3-16k-blocks-were-found-in-1-day/

- Jameson

On Thu, Jun 28, 2018 at 9:22 AM Mattia Rossi via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Hi all,
>
> Maybe is a common 'issue' but why the testnet3 of bitcoin network
> generate a block so fast?
> at lead 6 block per minute.
>
> Is this a normal behavior?
>
> Thanks in advance.
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