Solana Unveils Alpenglow Upgrade on Testnet, Promising 99% Faster Transaction Finality
September 23, 2026
Solana’s major Alpenglow consensus upgrade reached its second public testnet phase on September 26, aiming to cut finality from about 12.8 seconds to roughly 150 milliseconds by switching from TowerBFT to the Votor mechanism, marking one of the network’s largest protocol upgrades.
Anza, the developer group, has recommended Agave 4.3 for mainnet validators and is rolling it out progressively, with Firedancer and Frankendancer support not yet available for Alpenglow testing.
Alpenglow has progressed to active status on both devnet and testnet, allowing developers to test near-finality behavior ahead of any potential live deployment.
Key support levels to watch on Solana’s price include the September lows at around $112, $111, and $101, with a strong, high-volume move above $120 potentially challenging the current resistance.
Observed credit losses influence staking rewards, but the study does not quantify SOL payouts or prove shorter slots caused the credit gap, making it an economic and speed consideration.
Market drivers remain Middle East tensions and US monetary policy; a breakthrough in US-Iran talks or a dovish stance could support Solana, while stalemate could keep pressure on prices.
A recurring pattern shows early investors who buy before exchange listings tend to reap the biggest gains, as seen with SOL and earlier meme assets.
Because votes are no longer recorded as transactions, some activity metrics may appear lower on charts; data providers have been advised to adjust comparisons accordingly.
Remittix Markets handles hundreds of perpetual pairs with significant volume; its iOS wallet is live, Android is planned, and Earn offers up to 22% APY on qualifying holdings.
Technically, Solana’s daily outlook showed gains with risk appetite improving, but momentum faded; a bullish path would see price approach 149, with support near 97 if downside pressure resumes.
ETF inflows into Solana funds have slowed dramatically, from roughly $154 million to about $6 million weekly, while Solana hosts around $465 million in tokenized stocks.
Solana’s market cap sits near $73 billion with about 588 million SOL circulating, implying substantial new buying needed for price moves, as ETF inflows into SOL-related funds collapsed early in September.
Summary based on 11 sources
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Sources

CoinDesk • Sep 23, 2026
Solana starts testing upgrade that could cut finality from 12.8 seconds to 150 milliseconds
CryptoSlate • Sep 23, 2026
Solana moves Alpenglow into testnet as SOL nears January highs