Solana cuts its slot time to 350 milliseconds

Solana reduced its mainnet slot time from 400 milliseconds to 350 milliseconds at the start of epoch 1020 on 21 August, a 12.5 percent cut and the first slot-time reduction in the network's history. The change follows SIMD-0525, a Solana Improvement Document that lays out four sequential 50-millisecond reductions, taking slot time from 400ms down to 350ms, then 300ms, 250ms and finally 200ms.

Each further step needs supermajority validator approval before it can activate, so the pace of the remaining three cuts depends on validator operators upgrading and voting rather than a fixed schedule. Reaching the 200-millisecond target would halve the network's block time from where it started.

Faster slot times shorten how long traders and consumer apps wait for a transaction to land, which matters most for use cases that compete directly with centralised, low-latency systems.