Solana's Alpenglow Upgrade Slashes Transaction Finality to 150 Milliseconds
Solana’s first significant consensus upgrade, named Alpenglow, was launched on its mainnet at approximately 13:54 UTC on Wednesday, as reported by the Solana Foundation’s Alpenglow dashboard.
Alpenglow aims to shorten transaction finality time by 99%, bringing it down to around 150 milliseconds from the previous average of about 12.8 seconds, according to the Solana Foundation’s announcement in July.
The initial phase of the upgrade, called Votor, replaces the existing voting and finalization mechanism with a new system featuring direct validator votes and a certificate-based approach. This change is designed to reduce transaction finality to roughly 150 milliseconds. A subsequent phase, Rotor, will introduce a new block data distribution protocol to replace the current Turbine system.
Alpenglow represents the first major consensus change to Solana’s TowerBFT model. Its goal is to achieve 150-millisecond transaction finality, bringing confirmation times close to instantaneous. This improvement is expected to speed up payments, trade settlements, and enhance application responsiveness.
Cointelegraph reached out to the Solana Foundation for insights regarding the finality times measured during testing phases and the anticipated real-world network performance after the upgrade.
According to the Alpenglow dashboard at the time of writing, Solana’s mainnet was showing a transaction finality time of 6.6 seconds along with a throughput of 4,721 transactions per second.
In May, Anza researchers described Alpenglow as the "biggest change to Solana’s core protocol" since its launch.
They forecast that with a 150-millisecond latency, Solana could rival Web2 infrastructure in terms of responsiveness. This enhancement could enable blockchain to support entirely new categories of applications, as stated by Anza researchers Quentin Kniep, Kobi Sliwinski, and Roger Wattenhofer on May 19.
Earlier in August, Solana reduced its slot time for the first time since its inception as part of plans to halve slot durations to 200 milliseconds. This measure was intended to improve latency and speed up transaction confirmations, with the fourth stage of this plan completed by October.
Following Alpenglow, Solana validators will focus on the Agave 4.5 update, currently in development and scheduled for release in December 2026. This upgrade proposes increasing the number of accounts supported by versioned transactions from 64 to 96, potentially improving swap routes and execution prices per the Solana Foundation.
The price of Solana’s native token, SOL, rose nearly 3% in the 24 hours prior to the upgrade, recovering some ground from a 42% decline over the past year, according to CoinMarketCap.
The Alpenglow upgrade marks a pivotal advancement for Solana, drastically reducing transaction finality and positioning the platform to compete with traditional Web2 infrastructure by enabling faster, more responsive blockchain applications. This could open doors for blockchain technology to be adopted in new, latency-sensitive use cases.
This milestone represents a crucial step towards making decentralized networks as efficient as conventional systems, potentially accelerating blockchain’s integration into mainstream financial and digital services.
By decreasing transaction confirmation times to near-instantaneous speeds, Alpenglow enhances user experiences and broadens the scope for complex decentralized applications requiring rapid transaction finality.
The ongoing developments, including the Agave 4.5 update, indicate continued efforts to refine Solana’s scalability and network efficiency, promising more robust and cost-effective operations for users and developers alike.
Why it matters
Alpenglow significantly advances Solana’s network speed and responsiveness, which is essential for enabling blockchain platforms to support more demanding and latency-sensitive applications, bridging the gap with traditional web technologies.
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