# Arbitrum-Nitro

By [zak](https://paragraph.com/@zapperdao) · 2022-08-07

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Nitro is a significant technical upgrade, bringing changes across the stack that dramatically improve the experience of building on Arbitrum

*   **Advanced Calldata Compression,** which further drives down transaction costs on Arbitrum by reducing the amount of data posted to L1.
    
*   **Ethereum L1 Gas Compatibility,** bringing pricing and accounting for EVM operations perfectly in line with Ethereum.
    
*   **Additional L1 Interoperability,** including tighter synchronization with L1 Block numbers, and full support for all Ethereum L1 precompiles.
    
*   **Safe Retryables,** eliminating the failure mode where a retryable ticket fails to get created.
    
*   **Geth Tracing,** for even broader debugging support.
    
*   And many, many more changes.

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*Originally published on [zak](https://paragraph.com/@zapperdao/arbitrum-nitro)*