Ethereum scalability solution is one of most active topics in the Ethereum community. The following are a few areas of concern the community is trying to tackle:
- Transaction processing and block creation time with PoW—how fast can the miners process all transactions and create a new block through mining?
- Transaction finality – how soon can the decentralized network reach consensus that a transaction has happened and can't be reverted? Currently it takes about six blocks in Bitcoin and 3-4 minutes in Ethereum for the network to consider a block is finalized in the main chain. Interested readers should check out Vitalik's block for transaction settlement and block finality probability (https://blog.ethereum.org/2016/05/09/on-settlement-finality/ ...