Solana activates first slot time reduction to 350ms on testnet

Solana just took its first concrete step toward doubling its confirmation speed. On August 5, the network activated a slot time reduction from 400 milliseconds to 350 milliseconds on testnet, kicking off a phased upgrade that aims to eventually cut slot duration in half. The change is governed by SIMD-0525, a proposal that lays out four sequential 50ms decrements. The end goal: 200ms slots. How the upgrade works Anza CEO Brennan Watt announced the activation just hours before it went live, urging validators to upgrade to the Agave v4.2 client. Each 50ms reduction can only activate after receiving supermajority endorsement from validators, meaning roughly two-thirds of staked validators need to explicitly opt in before anything changes. There’s also a built-in buffer: a one-epoch delay between when a feature activates and when it actually takes effect. In Solana terms, an epoch lasts about two to three days. The delay gives operators time to confirm everything is running smoothly before the network commits to the new parameters. No breaking changes were reported on testnet during this first transition. For context, slot time is the interval during which a validator produces a block....