Reduced Slot Times
Q3 2026 • Solana Foundation
Solana will reduce its slot times from 400ms to 200ms. This change was first discussed in SIMD Discussion 469 and formally proposed and approved in SIMD-0525. This change will make the protocol more competitive in terms of latency. It takes advantage of the performance improvements made to Solana validator clients especially in Turbine, and Replay.
This also doubles as a censorship resistance measure since it narrows the time a leader has a monopoly over block building. Together with the separately proposed reduction of consecutive leader slots, this improves fairness for validators and users by limiting individual leader control windows.
| Expected Mainnet Activation Date | Q3 2026 |
| Devnet Activation | Q3 2026 |
| Breaking Change? | Yes |
| Indexing Changes Required? | TBD |
Technical Details
Slot Duration
Default slot duration is defined as the default number of milliseconds per tick (based on Solana's proof of history) multiplied by the default number of ticks per slot. It currently sits at 400ms, which was considered very fast at the time it was implemented.
The decrease to 200ms will not change the ticks per slot, the leader span of four slots, and the slots per epoch.
This time gives ample chance for the other validators to replay the transactions within the block and vote on whether a block is valid and should be included in the chain.
Concurrently, the next leader is receiving transactions via Gulf Stream and has to complete its blocks within the same timeframe.
Phased implementation
The network created four feature gates in successive epochs for this change. It will reduce the slot times in 50ms decrements:
- 400ms -> 350ms
- 350ms -> 300ms
- 300ms -> 250ms
- 250ms -> 200ms
The agreement in the validator discussion is that the network will not move to the next reduction if the block skip rates are too high.
About This Upgrade
Decreasing slot times allows the network to be more competitive to other blockchain protocols. This change also sets a precedent for future latency improvements.
Users will experience faster confirmation times on their transactions. Market makers will be able to quote tighter spreads.
Validators will enjoy shorter epochs, which means they are rewarded faster for adopting the performance improvements on Mainnet.
Learn more: Solana Upgrades