Solana reduces block confirmation time to 350 milliseconds

Solana's mainnet has reduced its block confirmation time from 400 milliseconds to 350 milliseconds following its first staged slot-time reduction. This change, confirmed by the Solana Foundation, was activated at slot 440,208,000, marking the start of epoch 1019. The new timing took effect with the beginning of epoch 1020 on Aug. 21. A slot is the period during which a validator can produce a block, while an epoch consists of 432,000 slots. Post-change measurements from Trillium show a slot-weighted mean of 365.4 milliseconds across 431,505 timed slots in epoch 1021, down from 420.7 milliseconds in epoch 1015. The number of skipped slots also decreased from 1,890 (0.438%) in epoch 1015 to 331 (0.077%) in epoch 1021, indicating early stability. The reduction in slot time shortens the leader window from 1.6 seconds to 1.4 seconds, allowing blocks to arrive more frequently. Solana's upgrade roadmap includes further reductions to 300 milliseconds, 250 milliseconds, and ultimately 200 milliseconds, with each stage requiring a one-epoch delay for validators to implement changes. As of Aug. 26, the 300 milliseconds stage was pending, expected to take effect at epoch 1024 around Aug. 28.

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