Sei Giga upgrade targets 200,000 TPS and 400ms finality
In brief
- Sei Labs published Giga upgrade whitepaper on May 19, 2025, targeting 200,000 TPS and sub-400ms finality
- Autobahn consensus and asynchronous execution decouple transaction ordering from processing for performance gains
- Full rollout expected H1 2026; SIP-3 migration testnet phases scheduled for Q1 2026
The architecture behind Giga
The Giga upgrade introduces Autobahn, a consensus protocol enabling parallel block proposals from multiple validators simultaneously. This removes the sequential bottleneck that constrains most blockchains. The upgrade also introduces asynchronous execution, which decouples transaction ordering from transaction processing, allowing the network to batch and execute transactions more efficiently.
Sei's roadmap breaks the work into three primary workstreams: execution, consensus, and storage. Together, these could enhance EVM throughput by up to 50 times, according to a detailed roadmap the team published in December 2024.
The network has already demonstrated roughly 400ms block times on mainnet through what Sei calls Twin Turbo optimizations. Giga builds on Sei v2, which launched in July 2024 and introduced parallel execution capabilities.
Competitive context and market implications
For context, Ethereum processes roughly 15-30 TPS on its base layer. Solana, the current speed darling, has a theoretical ceiling around 65,000 TPS but real-world throughput that's significantly lower. Sub-400ms finality would make on-chain order books genuinely competitive with centralized exchange matching engines, which operate at similar latencies.
This matters for DeFi. Order book DEXs and high-frequency trading strategies require speed and certainty. If Sei can deliver sub-400ms finality at scale, it opens a design space that's been closed to most blockchains.
Timeline and EVM transition
Sei Labs expects a rollout of the full Giga upgrade in the first half of 2026, with testnet phases for the SIP-3 migration scheduled for Q1 2026. SIP-3 is a community-supported proposal to transition Sei into a purely EVM-compatible chain. Right now, Sei operates with both EVM and CosmWasm execution environments. The target completion for that migration is mid-2026.
The rollout timeline is also tied to developments in Minimum Extractable Value protections and AI tooling, with no fixed hard deadline. Labs is prioritizing correctness over speed.
"Sei Giga is not just another EVM chain. It's a reimagining of what's possible for blockchain performance." — Jay Jog, Sei co-founder
Frequently asked questions
What is the Giga upgrade?
The Giga upgrade is Sei's redesigned architecture targeting 200,000 TPS and sub-400ms finality. It introduces Autobahn consensus (enabling parallel block proposals) and asynchronous execution (decoupling transaction ordering from processing). The upgrade represents roughly a 40x performance boost over Sei's prior 5,000 TPS capability.
When will Giga launch?
Sei Labs expects full rollout in the first half of 2026. Testnet phases for the SIP-3 migration (transitioning to pure EVM) are scheduled for Q1 2026, with target completion mid-2026. The timeline is tied to MEV protections and AI tooling development.
How does Giga compare to Ethereum and Solana?
Ethereum processes roughly 15-30 TPS on its base layer. Solana has a theoretical ceiling around 65,000 TPS but significantly lower real-world throughput. Giga's 200,000 TPS target with sub-400ms finality would exceed both and make on-chain order books competitive with centralized exchange matching engines.
