The Alpenglow upgrade, marking the largest consensus overhaul in Solana's history, is now live for testing on a community cluster as of May 11, 2026. This upgrade replaces the existing Proof of History and TowerBFT systems, which currently require approximately 12.8 seconds for transaction finality. Alpenglow aims to achieve finality in under 150 milliseconds, significantly enhancing Solana's capacity to support real-time applications such as high-frequency decentralized finance (DeFi) and gaming. The new voting protocol, Votor, collapses the voting process to one or two rounds, allowing for rapid consensus and utilizing off-chain messaging to optimize performance. Meanwhile, Rotor replaces the existing data relay mechanism, improving network efficiency. The upgrade was overwhelmingly supported by validators, with 98.27% voting in favor by September 2025. If successful, Alpenglow could position Solana as a leader in transaction speed, making it faster than traditional payment systems like Visa, which typically takes 1 to 3 seconds for authorization. This upgrade not only enhances performance but also signifies Solana's ambitious technical evolution, with implications for transaction economics and decentralized applications.