Solana Speeds Up Blocks to 350 Milliseconds, Targets 200

Solana has reduced the time between blocks on its mainnet to 350 milliseconds, the fastest block interval since the network launched, as developers work toward a further reduction to 200 milliseconds.

The change was approved in May through the technical proposal SIMD-0525 and is designed primarily to reduce network latency rather than increase throughput.

Solana Reduces Slot Time to 350 Milliseconds

Solana divides time into short intervals known as slots. During each slot, a designated validator, known as the leader, produces a block. Because each leader is assigned four consecutive slots, reducing the slot time from 400 milliseconds to 350 milliseconds shortens the leader rotation interval from 1.6 seconds to 1.4 seconds.

If the network eventually reaches the 200-millisecond target, each leader would control four slots for a total of 0.8 seconds.

The shorter slots are intended to allow transactions to move through the network more quickly, potentially improving the user experience for decentralized applications, payments and decentralized finance. However, the change does not increase the number of transactions that can fit into a single slot, meaning it is primarily a latency improvement rather than a throughput increase.

The shorter leader rotations could also reduce the amount of time any individual validator controls block production. Solana developers argue that this could limit opportunities for validators to deliberately delay or selectively filter transactions, potentially improving resistance to censorship.

Solana’s Four-Step Path to 200-Millisecond Block Times

Solana plans to reduce block time in four 50-millisecond steps from 400 ms to 200 ms.

The network will use a Feature Gate to activate each reduction, allowing developers to monitor stability before moving to the next stage. Each change is tied to a subsequent 432,000-slot epoch and can be postponed if network conditions deteriorate, including if too many blocks are skipped.

Solana has pointed to improvements to Turbine, its block-propagation system, and Replay, which validators use to verify and vote on blocks, as factors that have made the shorter slots possible.

The shorter slot times are separate from Solana’s work on Alpenglow, a new consensus protocol aimed at speeding up transaction finality. Solana currently takes roughly 12.8 seconds to reach finality, while Alpenglow is designed to reduce that to about 100 to 150 milliseconds.

Unlike shorter slots, which reduce the interval between block-production opportunities, Alpenglow is intended to improve the consensus process itself. Its proposed design is also intended to maintain finality if 20% of validators are malicious and another 20% are offline.

Why This Matters

Faster block times could mean transactions move through Solana more quickly, especially for trading and payments. Combined with Alpenglow, the changes could also help users know much sooner when a transaction is final.

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