Blockchain Academy
We'll get together for networking with people interested in Blockchain including developers and anyone curious about Blockchain.

Scalability

Scalability refers to the degree to which you can flexibly respond to an increase in the number of users and is a concept that always appears when discussing transaction processing performance. Ethereum is aiming for a platform for next generation smart contract and decentralization applications based on block chains. By eliminating the inconvenience users feel, more people will use the Ethereum platform. However, Ethereum currently has 15-20 transactions per second (as of March 2019). This is very slow compared to handling about 10,000 credit cards per second, so it is currently difficult to apply to applications that require fast processing speeds.

Ethereum is currently using the PoW algorithm, and it controls the difficulty level so that one block can be mined in about 15 seconds. Of course, by lowering the difficulty, we can get the blocks to be mined quickly, but there will be several blocks at the same time, which will lead to poor security. In addition, there is no capacity limit for Ethereum blocks, but there is a concept of gas limits, so the maximum amount of gas that a user who generates a transaction has to pay is set in one block. (8,000,029 as of March 2019) If you perform more complex transactions, the gas is consumed so much that it becomes increasingly difficult to process many transactions.