The backing group size on Kusama (and Polkadot) has been set to 5 (configuration->activeConfig->maxValidatorsPerCore). This proposal is aiming at reducing the group size to 3.

Currently, when a parachain produces a block, it requires 2 out of 5 backing validators to verify and sign it in order to back it and move forward. With 2-of-3, we'd guarantee that backing quorum is a group supermajority, so there're not two competing 2/5 backed candidates. And one extra validator is allowed to be slow.
Smaller backing groups should also contribute to distributing the load of approval-checking more evenly.

There's a small risk, however, that with slow/unresponsive validators, parachain slots might be skipped more often with 2/3 instead of 2/5. This should not be an issue in practice since validator groups rotate every minute.

- Currently, there are 5 validators needed to back a block on Kusama and Polkadot.
- There is a proposal to reduce the number of validators needed to 3.
- This change would make it easier for blocks to be backed and move forward.
- It would also help distribute the workload more evenly.
- There is a small risk that blocks might be skipped more often with this change, but it should not be a big problem.

#294 Set backing group size to 3

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