TL;DR
Solana completed two protocol upgrades in October, cutting target slot times to 200 milliseconds on October 9 and activating Alpenglow on mainnet on October 21.
Alpenglow replaced TowerBFT and targets transaction finality of roughly 150 milliseconds, while the slot-time reduction halves Solana’s original 400-millisecond target interval.
October also brought tooling updates, including Jito’s BAM Direct Bundle Ingest, Solana Microscope, Transaction V1 support in Jupiter’s Swap API and Solana Asset Registry.
Solana completed two protocol upgrades in October that shortened both slot production and transaction finality. According to the Solana Foundation’s October ecosystem roundup , the network activated the final stage of SIMD-0525 on October 9, reducing its target slot time from the original 400 milliseconds to 200 milliseconds. The change effectively halves Solana’s original target interval between slots , giving applications more frequent network updates. The upgrade marks another performance milestone for Solana as its infrastructure continues evolving. October’s network changes formed part of a month that also saw record RWA value across the ecosystem.
Alpenglow Replaces TowerBFT With Faster Finality
The second major change arrived on October 21, when Alpenglow went live on mainnet and replaced TowerBFT as Solana’s consensus protocol. Alpenglow targets transaction finality of roughly 150 milliseconds , sharply reducing the time required for the network to finalize state under its new voting architecture. The activation followed previous testing and moved the consensus redesign from development into production, completing a major step in Solana’s technical roadmap after the earlier Alpenglow mainnet rollout . The Foundation described Alpenglow as a voting protocol and listed its activation as the second completed protocol upgrade of October.
The slot-time reduction and Alpenglow address different parts of network performance. Shorter slots increase how frequently block-production opportunities occur, while faster finality reduces the delay before transactions are considered settled by consensus. Together, the October upgrades target lower latency at both block production and confirmation layers. Solana’s roundup lists the 200-millisecond target among October’s key network metrics, alongside the approximately 150-millisecond finality target, extending the network’s staged slot-time reduction program . That distinction matters because faster slot production and faster consensus finality describe separate stages of how information moves through the network in operation.
October also brought updates to developer infrastructure. Jito introduced BAM Direct Bundle Ingest, allowing approved participants to submit transaction bundles directly to BAM nodes, while Solana Microscope launched as an open-source monitoring tool for programs and Squads multisigs. Jupiter’s Swap API added opt-in support for Transaction V1, and the Solana Asset Registry introduced asset classifications and data feeds. The protocol upgrades therefore arrived alongside tooling designed to support applications and infrastructure operating on the faster network , reinforcing October’s focus on performance and developer functionality across the broader Solana ecosystem . These releases broadened October’s technical changes.
