Performance-based Validator Selection is a feature that allows users to choose validators in a Proof of Stake (PoS) blockchain network based on their past performance metrics. This feature aims to improve the overall efficiency and security of the network by ensuring that only the most reliable and effective validators are entrusted with the responsibility of validating transactions and maintaining the blockchain. By analyzing historical data such as uptime, transaction validation speed, and accuracy, stakeholders can make informed decisions about which validators to support, ultimately leading to a more robust and trustworthy network.