Solana Schedules October 21 Alpenglow Upgrade to Cut Finality to 150 Milliseconds

Solana developers have scheduled October 21 as the rollout date for the Alpenglow upgrade. The update is designed to bring transaction finality down to approximately 150 milliseconds. That figure represents a substantial drop from current finality times on the network. Finality refers to the point at which a blockchain transaction is considered permanently settled and cannot be reversed. Faster finality reduces the window of uncertainty for traders, developers, and applications that rely on quick settlement. For a network like Solana, which markets itself on high throughput and low latency, finality speed is a core performance metric.