Sei Giga Upgrade: From 10,000 to 200,000 TPS as Sei Abandons Cosmos for EVM-Only Chain

When Sei launched in 2023, it positioned itself as the fastest Cosmos chain with 20,000 theoretical TPS. Two years later, the network is making its most aggressive bet yet: Giga, an upgrade targeting 200,000 TPS with sub-400ms finality—and a controversial decision to abandon Cosmos entirely in favor of becoming an EVM-only chain.

The timing matters. Monad promises 10,000 TPS with its parallel EVM launching in 2025. MegaETH claims 100,000+ TPS capability. Sei isn't just upgrading—it's racing to define what "fast" means for EVM-compatible blockchains before competitors establish the benchmark.

What Giga Actually Changes

Sei Giga represents a ground-up rebuild of the network's core architecture, scheduled for Q1 2026. The numbers tell the story of ambition:

Performance Targets:

• 200,000 transactions per second (up from ~5,000-10,000 current)
• Sub-400 millisecond finality (down from ~500ms)
• 40x execution efficiency compared to standard EVM clients

Architectural Changes:

Multi-Proposer Consensus (Autobahn): Traditional single-leader consensus creates bottlenecks. Giga introduces Autobahn, where multiple validators simultaneously propose blocks across different shards. Think of it as parallel highways instead of a single road.

Custom EVM Client: Sei replaced the standard Go-based EVM with a custom client that separates state management from execution. This decoupling enables independent optimization of each component—similar to how databases separate storage engines from query processing.

Parallelized Execution: While other chains execute transactions sequentially, Giga processes non-conflicting transactions simultaneously. The execution engine identifies which transactions touch separate state and runs them in parallel.

Bounded MEV Design: Rather than fighting MEV, Sei implements "bounded" MEV where validators can extract value only within defined parameters, creating predictable transaction ordering.

The Controversial Cosmos Exit: SIP-3

Perhaps more significant than the performance upgrade is SIP-3—the Sei Improvement Proposal to deprecate CosmWasm and IBC support entirely by mid-2026.

What SIP-3 Proposes:

• Remove CosmWasm (Rust-based smart contracts) runtime
• Deprecate Inter-Blockchain Communication (IBC) protocol support
• Transition Sei to a pure EVM chain
• Require existing CosmWasm dApps to migrate to EVM

The Rationale:

Sei's team argues that maintaining two virtual machines (EVM and CosmWasm) creates engineering overhead that slows development. EVM dominates developer mindshare—over 70% of smart contract developers work primarily with Solidity. By going EVM-only, Sei can:

1. Focus engineering resources on a single execution environment
2. Attract more developers from the larger EVM ecosystem
3. Simplify the codebase and reduce attack surface
4. Maximize parallel execution optimizations

The Criticism:

Not everyone agrees. Cosmos ecosystem participants argue that IBC connectivity provides valuable cross-chain composability. CosmWasm developers face forced migration costs. Some critics suggest Sei is abandoning its differentiated positioning in favor of competing directly with Ethereum L2s.

The counterargument: Sei never achieved significant CosmWasm adoption. Most TVL and activity already runs on EVM. SIP-3 formalizes the reality rather than changing it.

Performance Context: The Parallel EVM Race

Sei Giga launches into an increasingly competitive parallel EVM landscape:

Chain	Target TPS	Status	Architecture
Sei Giga	200,000	Q1 2026	Multi-proposer consensus
MegaETH	100,000+	Testnet	Real-time processing
Monad	10,000	2025	Parallel EVM
Solana	65,000	Live	Proof of History

How Sei Compares:

vs. Monad: Monad's parallel EVM targets 10,000 TPS with 1-second finality. Sei claims 20x higher throughput with faster finality. However, Monad launches first, and real-world performance often differs from testnet numbers.

vs. MegaETH: MegaETH emphasizes "real-time" blockchain with 100,000+ TPS potential. Both chains target similar performance tiers, but MegaETH maintains EVM equivalence while Sei's custom client may have subtle compatibility differences.

vs. Solana: Solana's 65,000 TPS with 400ms finality represents the current high-performance benchmark. Sei's sub-400ms target would match Solana's speed while offering EVM compatibility that Solana lacks natively.

The honest assessment: All these numbers are theoretical or testnet results. Real-world performance depends on actual usage patterns, network conditions, and economic activity.

Current Ecosystem: TVL and Adoption

Sei's DeFi ecosystem has grown significantly, though not without volatility:

TVL Trajectory:

• Peak: $688 million (early 2025)
• Current: ~$455-500 million
• YoY growth: Approximately 3x from late 2024

Leading Protocols:

1. Yei Finance: Lending protocol dominating Sei DeFi
2. DragonSwap: Primary DEX with significant volume
3. Silo Finance: Cross-chain lending integration
4. Various NFT/Gaming: Emerging but smaller

User Metrics:

• Daily active addresses: ~50,000-100,000 (variable)
• Transaction volume: Increasing but behind Solana/Base

The ecosystem remains smaller than established L1s but shows consistent growth. The question is whether Giga's performance improvements translate to proportional adoption increases.

Developer Implications

For developers considering Sei, Giga and SIP-3 create both opportunities and challenges:

Opportunities:

• Standard Solidity development with extreme performance
• Lower gas costs from efficiency improvements
• Early mover advantage in high-performance EVM niche
• Growing ecosystem with less competition than Ethereum mainnet

Challenges:

• Custom EVM client may have subtle compatibility issues
• Smaller user base than established chains
• CosmWasm deprecation timeline creates migration pressure
• Ecosystem tooling still maturing

Migration Path for CosmWasm Developers:

If SIP-3 passes, CosmWasm developers have until mid-2026 to:

1. Port contracts to Solidity/Vyper
2. Migrate to another Cosmos chain
3. Accept deprecation and wind down

Sei has not announced specific migration assistance, though community discussions suggest potential grants or technical support.

Investment Considerations

Bull Case:

• First-mover in 200,000 TPS EVM space
• Clear technical roadmap with Q1 2026 delivery
• EVM-only focus attracts larger developer pool
• Performance moat against slower competitors

Bear Case:

• Theoretical TPS rarely matches production reality
• Competitors (Monad, MegaETH) launching with momentum
• CosmWasm deprecation alienates existing developers
• TVL growth hasn't matched performance claims

Key Metrics to Watch:

• Testnet TPS and finality in real-world conditions
• Developer activity post-SIP-3 announcement
• TVL trajectory through Giga launch
• Cross-chain bridge volume and integrations

What Happens Next

Q1 2026: Giga Launch

• Multi-proposer consensus activation
• 200,000 TPS target goes live
• Custom EVM client deployment

Mid-2026: SIP-3 Implementation (if approved)

• CosmWasm deprecation deadline
• IBC support removal
• Full transition to EVM-only

Key Questions:

1. Will real-world TPS match 200,000 target?
2. How many CosmWasm projects migrate vs. leave?
3. Can Sei attract major DeFi protocols from Ethereum?
4. Does performance translate to user adoption?

The Bigger Picture

Sei's Giga upgrade represents a bet that raw performance will differentiate in an increasingly crowded blockchain landscape. By abandoning Cosmos and going EVM-only, Sei is choosing focus over optionality—betting that EVM dominance makes other execution environments redundant.

Whether this bet pays off depends on execution (pun intended). The blockchain industry is littered with projects that promised revolutionary performance and delivered moderate improvements. Sei's Q1 2026 timeline will provide concrete data.

For developers and investors, Giga creates a clear decision point: believe Sei can deliver on 200,000 TPS and position accordingly, or wait for production proof before committing resources.

The parallel EVM race is officially underway. Sei just announced its entry speed.

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