Solana’s 150-millisecond settlement upgrade reaches second public test network
Summary
Solana’s Alpenglow upgrade is now available on devnet after completing its testnet transition, allowing application teams to test before any live-network rollout. It aims to reduce transaction finality from about 12.8 seconds to roughly 150 milliseconds by changing how validators reach consensus. The change may lower transaction counts that include validator votes, and transaction-history services must handle competing candidate blocks correctly. Basic apps that send transactions and read balances need no migration. The 150-millisecond figure is based on simulations, not live-market performance, and no mainnet launch date has been set.
