This referenda increases the parachain validator set size from 400 to 500 and the maximum backing group size from 4 to 5. The total number of usable cores remains 100.
The reasons for also changing the backing group size are:
- https://kusama.polkassembly.io/referenda/294 changes to a backing group of less than 5 has shown to increase parachain block times
- keeping the same number of total cores such that all 100 backing groups get rewards given the session is 1 hour and group rotations happen every 1 minute
For more details check out: https://forum.polkadot.network/t/update-parachain-validator-set-size-increase-on-kusama/8218
Whitelisted by https://kusama.subsquare.io/fellowship/referenda/85