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4 Battle-Tested Techniques for Runtime Gas Optimization in Defi Contracts

Abstract

This article summarizes the author’s practical engineering insights and architectural lessons derived from achieving a top-3 leaderboard finish in BuidlGuidl’s recent high-level ETH Techtree Solidity programming competition. It systematically explores four battle-tested runtime gas optimization techniques tailored for decentralized finance (DeFi) smart contracts: Lazy Accounting & Accumulator Patterns, Storage Slot Packing & Bitmasking, Batching & Execution Amortization, and Lightweight Temporal State Machines.

In addition, the article examines the foundational mechanics of EVM gas metering, the critical architectural drivers behind gas reduction, and why gas optimization serves as an indispensable competency for mid-to-senior Web3 developers. By conducting a rigorous analysis of low-level EVM opcode costs, state storage behavior (SLOAD/SSTORE), and memory manipulation dynamics, this work provides clear, actionable solutions to critical and pressing real-world engineering challenges—such as high user transaction fees, execution bottlenecks during peak mainnet congestion, protocol liquidity friction, and gas-driven security vulnerabilities in production smart contracts.

Introduction

In...

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