Solana has dramatically accelerated its transaction finality with the Alpenglow consensus upgrade, currently running on a test cluster since May 11. The upgrade, developed by Anza, slashes finality from 12.8 seconds to under 150 milliseconds-a roughly 100-fold improvement.
Finality is the point at which a transaction becomes irreversible. For trading, payments, and gaming, that window is critical. At 12.8 seconds, Solana was already competitive with most blockchains. Ethereum's finality typically takes 12 to 15 minutes. But sub-150-millisecond finality puts Solana in a class that rivals Visa or Nasdaq's matching engines.
The upgrade passed a governance vote in September 2025 with 98% approval.
SOL's price surged over 15% within 24 hours of the announcement. Analyst Scott Melker noted the upgrade could transform user experience across DeFi, gaming, and trading.
Solana has been working to overcome a reputation for outages during peak congestion in 2022 and 2023. Anza is now encouraging more validators to join the test cluster ahead of a potential mainnet deployment in Q3 2026.
Test clusters are controlled environments. Real-world performance with thousands of validators will differ. Investors should watch validator participation and Anza's timeline for mainnet deployment.