Solana Cuts Mainnet Slot Time to 350 Milliseconds in First Step Toward 200ms Goal

3 min readPublished 22 Aug 2026

Solana has activated the first cut in a planned series of slot-time reductions, moving its target block interval from 400 milliseconds to 350 milliseconds. The change, confirmed by both Cointelegraph and The Defiant, marks the network’s first adjustment to slot timing since genesis and is intended as the opening stage of a four-part path toward a 200-millisecond target.

What happened

According to Cointelegraph, Solana Foundation vice president of technology Jacob Creech announced the change in a Friday post on X, saying, “We’re in a new era of 350ms. Next stop, 300ms,” as reported by the outlet. The Defiant’s reporting, held by this publication only as a search-index summary, corroborates the core move: a reduction from 400 to 350 milliseconds as part of a four-stage plan to reach 200 milliseconds, with Creech described by that outlet as calling it Solana’s first slot-time reduction.

Cointelegraph reported that the Solana Foundation first laid out plans in June to cut slot times from 400ms to 200ms in stages, arguing the change would improve latency and speed up confirmations. Three further 50ms reductions remain planned after this one.

Where the reporting agrees, and where it doesn’t

Cointelegraph and The Defiant agree on the headline move: a cut from 400ms to 350ms as the first of four stages toward 200ms, and both independently corroborate Creech’s framing of the change and his stated next target of 300ms. The Block‘s headline — the only portion of its reporting available to this publication — describes the same move as a first step toward a 200ms goal, consistent with that framing, though no further detail from The Block can be confirmed here. Beyond that consensus, the accounts diverge in what they cover, not in what they claim — each outlet supplies technical detail the others do not.

The Defiant alone reports that the underlying feature, SIMD-0525, activated at slot 440,208,000 in epoch 1019, and that the network is built to pause the rollout if block skip rates climb. Neither Cointelegraph nor The Block corroborates the exact activation slot or the skip-rate safeguard.

Cointelegraph alone reports that SIMD-0525 was approved and merged on May 14, that all four stages are targeted for mainnet activation in the Agave v4.2 validator client — though it describes that schedule as tentative — and that average slot times stood at 360ms at press time, per the Solana slot time explorer. Taken at face value, that figure would sit above the new 350ms target, though no outlet frames the comparison explicitly; it is a reading of the two numbers reported, not a claim either outlet makes directly.

Why it matters

This is the first concrete step on a roadmap the Solana Foundation described in June, according to Cointelegraph, and it follows the underlying SIMD-0525 proposal, which Cointelegraph reported was approved and merged on May 14.

What’s unresolved

Exact timing for the remaining reductions — to 300ms and, ultimately, 200ms — beyond the tentative Agave v4.2 target has not been detailed by any outlet in this reporting. It’s also unclear what skip-rate threshold would trigger a pause in the rollout that The Defiant describes, or whether such a pause has been tested. And whether the network’s observed performance, reported by Cointelegraph at a 360ms average, will converge with the 350ms target over time remains to be seen.

What to watch next

Rollout of the next scheduled reduction, to 300ms, per Creech’s stated target
Whether block skip rates rise enough to pause or delay subsequent stages, per The Defiant’s reporting on the safeguard
The Agave v4.2 client release schedule and whether all four stages ship on the same timeline, which Cointelegraph describes as tentative