Solana could be gearing up for another major growth catalyst as a long-awaited network upgrade moves into the public testnet, with developers targeting a dramatic cut in transaction finality from 12.8 seconds to just 150 milliseconds. The upgrade could mark a major leap in Solana’s performance and reignite bullish attention as the network races to make transactions faster, more efficient, and better able to handle greater demand.
Solana’s Alpenglow Upgrade Moves Closer to Public Testnet Launch
A major Solana upgrade designed to push the network’s speed even further has now moved to the testnet stage, bringing the blockchain one step closer to a potentially transformative performance boost.
Solana currently relies on TowerBFT to reach consensus, allowing validators to agree on which transactions to permanently record on the network. In the current setup, validators cast votes on-chain and accumulate enough confirmations across 32 slots before a block reaches finality.
Alpenglow is designed to replace that process with a new voting protocol called Votor. Instead of recording votes directly on the blockchain, validators communicate their votes with one another, potentially reaching agreement within just one or two rounds. By eliminating the lengthy sequence of on-chain voting, the upgrade aims to dramatically accelerate Solana’s path to finality.
Developers are targeting finality of roughly 150 milliseconds, a dramatic reduction from Solana’s current 12.8-second level. If Alpenglow delivers the performance developers anticipate, transactions could reach finality approximately 85 times faster, representing a major acceleration for the network.
 
Validators participating in the testnet rollout must run Agave 4.3, the primary software client used to operate Solana and maintained by Anza, one of the network’s core development firms.
Anza recommended that all mainnet validators upgrade to Agave 4.3 on Sept. 21, following a phased rollout that first reached operators representing 10% and then 25% of the SOL securing the network.
Anza’s current schedule lists Sept. 28 as the tentative date for activating the features bundled into Agave 4.3 on Solana’s mainnet. However, the date should not be interpreted as a confirmed launch date for Alpenglow, with the upgrade’s full mainnet activation still subject to further testing and validation.
SOL is already showing signs of renewed momentum as the Alpenglow upgrade approaches a major testing milestone. The token has climbed sharply from around $98 in mid-September to roughly $118.41 as of press time, up about 19% over the period. With Alpenglow targeting a dramatic reduction in finality times, the upgrade could give traders another fundamental catalyst to watch as SOL attempts to extend its latest rebound.
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