Solana cut its target slot time from 400 milliseconds to 350 milliseconds on mainnet, the network's first slot-time reduction since inception. The change opens a four-stage path toward 200 milliseconds, with each further cut gated by block skip rates.
Solana has activated a mainnet feature that cuts its target slot time from 400 milliseconds to 350 milliseconds, the network's first slot-time reduction since its inception. The change shortens the window for leaders to complete blocks and aims to give users faster transaction confirmations. Solana's explorer lists the feature, SIMD-0525, as active on Mainnet Beta at slot 440,208,000 in epoch 1019.
Four Gates to 200 Milliseconds
Solana's approved sequence moves from 400 milliseconds to 350, then 300, 250 and finally 200 milliseconds, with each 50-millisecond reduction activating through a separate feature gate in a later epoch. The Solana Foundation says the network will not advance to the next step if block skip rates climb too high, so validators face a staged transition rather than a jump straight to the endpoint. Jacob Creech, vice president of technology at the Solana Foundation, said Friday that 300 milliseconds is the next target.
Shorter slots compress the time a leader has to complete a block, the time the next leader has to receive transactions through Gulf Stream, and the time other validators have to replay and vote on blocks. Solana said validator-client improvements, particularly in Turbine and Replay, enabled the plan.
What Stays the Same for Validators
The upgrade does not change the number of ticks per slot, the four-slot leader span, or the number of slots in an epoch; because those slots now arrive faster, validators move through epochs in less elapsed block time. Solana labels the overall upgrade a breaking change, and its documentation still describes the default slot duration as 400 milliseconds even though the explorer already shows the 350-millisecond feature live.
Anza's tentative Agave v4.2 schedule targets all four staged reductions for mainnet activation. The rollout is part of a broader performance-upgrade cycle that also includes an increase in block compute capacity. The Solana upgrade page does not list a calendar date or specific epoch for the 300-millisecond step, and the next reduction still depends on block skip rates staying low.
Sources: The Defiant, Crypto Briefing
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