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Gas Optimization

1 min read
Pronunciation
[gas op-tuh-muh-ZAY-shun]
Analogy
Gas optimization is like tuning an engine for fuel efficiency—you adjust code to do more work with less fuel (gas).
Definition
Techniques to reduce the gas consumption of smart contract operations, lowering transaction costs and improving performance.
Key Points Intro
Key gas optimization strategies include:
Key Points

Packing variables: Combine multiple small storage vars into one slot.

Minimizing storage writes: Storage is costliest; use memory when possible.

Efficient loops: Avoid unbounded loops and redundant computations.

Immutable & constant: Mark read‑only data to reduce access cost.

Example
Refactoring a contract to pack two uint128 variables into a single storage slot reduces gas per transaction by 20%.
Technical Deep Dive
Solidity assigns 32 byte storage slots; packing smaller types reduces SSTORE calls. Use unchecked blocks for safe arithmetic when overflow is impossible. Replace dynamic arrays with fixed-size where appropriate. Mark functions view/pure to skip state mutation checks.
Security Warning
Over‑optimizing can introduce subtle bugs; always re‑audit after major refactors.
Caveat
Some optimizations reduce readability and maintainability.
Related Terms
Solidity
EVM
Smart Contract Audit

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