Solana Cuts Mainnet Slot Time to 350 Milliseconds as SOL Nears $100

Solana successfully completed a mainnet upgrade Friday morning, reducing its target slot time to 350 milliseconds from the previous 400ms benchmark. A slot represents the brief window during which a designated validator produces a block of transactions on the network.

What the Upgrade Changes

This adjustment marks the first phase of SIMD-0525, a proposal merged in May that outlines a gradual path toward a final target of 200ms. According to the proposal, shorter slots reduce the time needed for transaction confirmation and finalization, since consensus thresholds measured in slots now take less real-world time to complete. The change also shortens Solana’s epochs, cutting their duration from roughly 48 hours to about 42 hours, while validators now rotate turns every 1.4 seconds instead of 1.6.

Faster Confirmations, Not Higher Throughput

Developers emphasized that while confirmation speed improves, this update does not increase the network’s overall transaction processing capacity, since each shorter slot carries proportionally less workload. A real-world measurement showed a 1,000-slot period taking 415 seconds before the change, compared to 368 seconds afterward.

More Reductions Planned

Solana developers intend to implement three additional 50ms reductions before reaching the final 200ms goal, with each stage activated separately and subject to pausing if validators struggle to keep pace. The next target of 300ms has not yet received a confirmed rollout date. Meanwhile, full transaction finality remains far slower, though Solana’s ongoing Alpenglow upgrade aims to eventually reduce that to roughly 150 milliseconds.

SOL’s approach toward the $100 mark comes alongside the network upgrade, reflecting renewed investor interest as Solana continues technical improvements aimed at faster transaction speeds.