Solana Plans to Cut Slot Time from 400ms to 200ms in Four Staged Steps

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Solana is preparing to halve its slot time from 400 milliseconds to 200 milliseconds through a proposal called SIMD-0525, rolling out across four incremental feature gates at 350ms, 300ms, 250ms, and finally 200ms. Each gate activates once 95% of staked validators run compatible software, taking effect at the start of the following epoch. While transactions per second remain roughly preserved, the compute limit per block will drop from 60 million to 30 million units, meaning large transactions that exceed new per-block thresholds may fail to fit at all. Time-sensitive operations tied to slot counts — such as blockhash expiry windows, epoch lengths, and vesting or liquidity lock schedules — will all shrink proportionally in real-world time even though their slot-count values stay unchanged. None of the four feature gates had been activated on any Solana cluster at the time of reporting, and no public activation schedule has been released.

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