Solana's Alpenglow Upgrade Reaches Both Public Test Networks
The consensus change targeting 150-millisecond settlement is now live on both of Solana's public test networks, giving developers a pre-mainnet testing environment.

Solana's Alpenglow upgrade is now running on both of the network's public test networks, according to CoinDesk. The milestone means application teams have a place to verify their software against the proposed consensus change before it is activated on the live blockchain.
Alpenglow is aimed at shortening settlement times to roughly 150 milliseconds. That target is considerably faster than the finality currently offered by Solana's mainnet, and it is the headline claim attached to the upgrade.
Why the testnet stage matters
Consensus changes are among the more disruptive updates a live blockchain can undergo, since they affect how validators agree on the ordering and finality of transactions. Running the software on public test networks first lets developers and infrastructure providers check compatibility and surface problems without putting mainnet funds or activity at risk.
No date has been given for mainnet activation. The upgrade remains a proposal in testing rather than a change to the live chain, and its eventual rollout will depend on how the software performs across the test networks and on the network's governance and validator coordination process.