-This week saw significant progress in simulation capabilities with the successful comparison of Rust and Haskell simulations across **[90 scenarios](https://github.com/input-output-hk/ouroboros-leios/blob/main/analysis/sims/2025w11/analysis.ipynb)**. We conducted our **first mainnet-scale [analysis](https://github.com/input-output-hk/ouroboros-leios/blob/main/analysis/sims/2025w11xl/analysis.ipynb) of Leios** on a [mainnet-scale network](https://github.com/input-output-hk/ouroboros-leios/blob/leios-2025w11/sim-rs/test_data/realistic.yaml) of 3000 nodes, revealing unexpected performance benefits from network topology. **[Sharding performance analysis](https://github.com/input-output-hk/ouroboros-leios/blob/main/analysis/shard-performance.ipynb)** provided important insights into optimization strategies. Both simulation implementations received improvements to enhance realism and comparability, while our formal methods team developed initial trace verification tools for Short Leios.
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