Solana block speed increased by 17%, transaction capacity remains unchanged

On Friday, Solana shortened the target slot time from 300 milliseconds to 250 milliseconds, increasing the network clock speed by nearly 17%. A slot is a short window designated for validators to add blocks. After the adjustment, Solana aims to produce about 4 blocks per second, up from about 3.3 blocks previously, allowing wallets, exchanges, and trading applications to obtain a more real-time network status.

Validators will still lead for 4 consecutive slots, so each leader's control window has been reduced from 1.2 seconds to 1 second, and the transaction ordering rights will be handed over to the next validator earlier. For applications such as oracle-driven markets and automated market makers, stale prices or hundreds of milliseconds of uncertainty can affect trade execution, and a faster clock is expected to reduce failed transactions and price deviations. However, the speed increase did not result in a 17% increase in original capacity; according to SIMD-0525, the allowed computation and data volume per slot has decreased by the same proportion, and the overall processing limit of the network remains basically unchanged.

This adjustment is the third phase of Solana's gradual reduction from 400 milliseconds to 350 and then to 300 milliseconds. Since the epoch is still fixed at 432,000 slots, its expected duration has decreased from about 36 hours to about 30 hours, leaving less time for offline signing and delayed approvals. There is currently no timeline for the proposed further reduction to 200 milliseconds to go live on the mainnet, and the network will advance only if the block skip rate remains acceptable at the 250 milliseconds stage.