A centralized database on a standard gigabit network can execute 710,000 transactions per second when transactions are no more than 176 bytes size on average. Without compromising decentralization, it is challenging for a blockchain to have such a high-speed transaction capacity.
Solana has accomplished an impressive transaction per second capacity without compromising decentralization much. It is an open-source project that is a new permissionless and high-performance blockchain. The Solana Foundation manages the open-source project, situated in Geneva, Switzerland. It is the high-speed layer one blockchain, with a max capacity of 65,000 transactions per second. It has a transaction finality of around 13 seconds.