Solana is nearing the completion of a seven-week network upgrade that aims to double its block production frequency. The change is expected to deliver more frequent blockchain updates, although validators will face higher operating expenses and shorter windows for transaction processing.

The final stage is scheduled for Friday, when Solana plans to reduce its target block time from 250 milliseconds to 200 milliseconds. The adjustment concludes a series of reductions that began in August.

Anza, the developer of Solana’s widely used Agave validator software, expects the change to take effect at epoch 1053, around 15:00 UTC.

Once implemented, the network will target five block-production opportunities per second, compared with 2.5 under the original 400-millisecond configuration.

A slot is the short interval in which a designated validator can add transactions to the blockchain. Reducing slot duration allows exchanges, wallets and trading applications to receive updated information more frequently, potentially cutting the time transactions spend waiting for processing.

Solana launched the upgrade sequence on August 21 by lowering its target slot time to 350 milliseconds. It subsequently reduced the interval to 300 milliseconds on August 28 and to 250 milliseconds on September 18.

The technical proposal, SIMD-0525, also adjusts the computational limit for each block.

At a 200-millisecond target, blocks will be capped at 30 million compute units, down from 37.5 million under the previous setting. While blocks will arrive more frequently, their individual capacity will decrease proportionally, leaving the network’s theoretical processing throughput broadly unchanged.

Validators will continue producing blocks in groups of four consecutive slots. However, their uninterrupted transaction-ordering window will shrink from 1.6 seconds under the original configuration to 800 milliseconds.

The reduced window could make it more difficult to delay transactions or exploit price movements on other exchanges before Solana updates its own transaction records.

The accelerated schedule also brings additional costs. Validators voting on every slot will need to submit votes approximately twice as frequently as before, potentially increasing expenses and placing additional pressure on network connections.

Wallets and other applications will also have less time to use a recent blockhash, which helps prevent transactions from being replayed. The shorter validity period could complicate transactions that require manual approval or offline signatures.

Mainnet results will reveal the upgrade’s impact

Solana Compass data indicates that average slot times under the previous 250-millisecond target were approximately 266–269 milliseconds across recent epochs, slightly above the intended duration.

The final adjustment has already been deployed on Solana’s testnet and devnet. Its mainnet implementation will depend on network conditions, especially how frequently validators miss their assigned block-production opportunities.

The transition is expected to occur at the start of epoch 1053 on Friday, completing Solana’s planned effort to shorten block times while keeping its theoretical processing capacity roughly stable.