Optimism vs Starknet: Throughput

Specific advantage: ~$0.01 average L2 fee for basic transfers (vs. Starknet's ~$0.05). This matters for mass-market dApps (e.g., social, gaming) where micro-transactions are frequent. Optimism's EVM-equivalent architecture means existing Solidity tooling (Hardhat, Foundry) works with minimal friction, accelerating development.

Specific advantage: ~1 hour to Ethereum finality via fault proofs (Cannon). This matters for bridges and exchanges (e.g., Across, Synthetix) that require strong economic guarantees. While slower than validity proofs, it provides a clear, auditable challenge period for high-value settlements.

Specific advantage: Validity proofs (STARKs) enable massive off-chain computation with a tiny on-chain footprint. This matters for complex DeFi strategies (e.g., zkLend, Nostra) and on-chain gaming where a single proof can verify thousands of state updates, avoiding per-transaction gas costs.

Specific advantage: Sub-second L2 confirmation with ~12-minute Ethereum settlement. This matters for high-frequency trading and responsive Web3 apps where user experience is critical. The Cairo VM is optimized for ZK-provable computation, enabling novel app designs impossible on EVM.

Optimistic Rollup design enables high, stable throughput by posting cheap data to Ethereum L1. Current TPS is ~2,000 (source: L2BEAT), with a theoretical ceiling tied to Ethereum's data availability. This matters for high-volume DeFi protocols like Uniswap and Perpetual Protocol that require consistent, low-cost execution.

1-hour challenge period means users experience fast, soft confirmation (seconds) for most actions, with full Ethereum-level security finalizing later. This matters for dApps prioritizing user experience, like NFT marketplaces and social apps, where perceived speed is critical.

ZK-Rollup (STARK) proofs compress computation more efficiently than data. This allows for a theoretical TPS in the tens of thousands as the proving technology matures, with less direct dependency on Ethereum's data bandwidth. This matters for mass-market gaming and complex on-chain logic where computational density is the bottleneck.

Validity proofs provide immediate, mathematically guaranteed finality upon L1 verification (~12 min), with no withdrawal delay. This matters for institutional DeFi, cross-chain bridges, and exchanges where capital efficiency and instant settlement are non-negotiable.

Faster finality for simple transactions: Optimism's optimistic rollup design provides soft confirmation in ~1 second, with full finality after the 7-day challenge window. This matters for DeFi protocols like Aave and Uniswap where user experience for swaps and deposits is critical.

Massive scalability via STARK proofs: Starknet's ZK-rollup architecture can batch thousands of transactions into a single proof, achieving ~100-200 TPS on mainnet with a roadmap to ~10,000 TPS. This matters for mass-market gaming and social apps requiring low-cost, high-volume interactions.

No withdrawal delays: Transactions are finalized on Ethereum L1 as soon as the validity proof is verified (~3-5 hours), unlike optimistic rollups' 7-day challenge period. This matters for bridges and exchanges where capital efficiency and security are paramount.

Inherits L1 data costs: Every transaction's calldata is posted to Ethereum, creating a hard ceiling on scalability and making throughput highly sensitive to L1 gas prices. This matters for applications predicting stable operating costs at scale.

Proof generation bottleneck: Creating STARK proofs for a batch adds latency (minutes to hours) before the batch is posted to L1. Developing in Cairo also requires a steeper learning curve. This matters for teams prioritizing sub-second user feedback or with existing Solidity expertise.