SBP: Block Production time

[NachoPal]

I noticed that you reduced MILLISECS_PER_BLOCK to 3000. Unless there is a very strong reason to reduce this value and necessary calculations have been done to ensure network stability, I would recommend to keep the default value of 6 seconds.

More info here: https://substrate.stackexchange.com/questions/1618/what-happens-when-i-decrease-the-millisecs-per-block-parameter-in-runtime-src

[NachoPal]

In addition, if you are planning to become a parachain at some point, you should know that right now the block production is set to 12 seconds.

[swowk]

thank you, Nacho. We also found this bottleneck in the development enviornment, and we will take into consideration for that.

[ytqaljn]

Now we have set it to 6000：
https://github.com/CESSProject/cess/blob/v0.5.1/runtime/src/lib.rs#L244