even though EOS might already support 1 million transactions per second, there’s still work on using more than just 1 blockchain. Where Proof-Of-Work blockchains create delay due to the search for the right hash, DPOS blockchains have a fixed time-slot when a block is produced. This means a faster settlement and also a faster “hop” from one chain to the other. That’s why adding several extra blockchains on EOS won’t cause a big delay. If they can get this to work properly EOS would be able to scale to even tens of millions transactions per second.