Solana Cuts Slot Time to 350ms in First Reduction Since Genesis

Solana has cut its blockchain slot time to 350 milliseconds, the first reduction of its kind since the network’s inception, according to Solana Foundation vice president of technology Jacob Creech. The change is the opening step in a broader effort to drive the network’s original 400-millisecond slot target down to 200 milliseconds, as reported by Cointelegraph.

First reduction since genesis

Creech confirmed the milestone in a post on X, writing, “We’re in a new era of 350ms. Next stop, 300ms.” The adjustment marks the first time Solana has lowered its slot time since the blockchain launched. For a network that has treated speed and low-latency execution as core design principles since genesis, the move carries both technical and symbolic weight, signaling that the foundation sees room to push performance further even after years of operation.

Where slot times stand now

According to the Solana slot time explorer, average slot times sat at roughly 360 milliseconds at press time, down from the network’s original 400-millisecond target. Slot time refers to the interval at which the network’s leader schedule rotates, and shorter slots are intended to tighten the gap between when a transaction is submitted and when it is confirmed on-chain, a metric that developers and traders alike watch closely.

A staged roadmap to 200ms

In June, the Solana Foundation shared plans to reduce slot times from 400 milliseconds to 200 milliseconds, arguing that the move would improve latency and accelerate confirmations across the network. The reduction is unfolding in 50-millisecond stages: the jump to 350ms is the first, and three further reductions of that size are planned before the network reaches its 200ms goal. The 50-millisecond increments mean the transition will unfold gradually rather than in a single jump to the final target. The shorter slot times are enabled by SIMD-0525, the proposal establishing the change, which was approved and merged on May 14.

Agave v4.2 and what comes next

All four stages of the reduction are targeted for mainnet activation in Agave v4.2, a validator client developed by Anza, although the schedule remains tentative. If the full roadmap is completed, Solana’s slot time would be halved from its original 400 milliseconds. The foundation has argued that tighter slots reduce the time between transaction submission and confirmation, a property that matters for payments and high-frequency applications. The change also raises the performance bar for validators, which must process and propagate blocks within a shrinking window. Creech’s “next stop, 300ms” comment signals the follow-on reductions could arrive as the client rollout proceeds.

For additional context, readers can review recent reporting on Solana-related build-pipeline risk and a related BlockchainReporter explainer.