Profiling Gas, Identifying Bottlenecks, and Optimization Patterns

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The concept Every EVM operation has a fixed gas cost, and a handful of operations dominate real-world contract bills: a cold SSTORE (writing a storage slot untouched this transaction) costs 20,000 gas going from zero to non-zero and roughly 2,900 overwriting a non-zero value; a cold SLOAD costs about 2,100 gas, dropping to 100 gas once "warm" (accessed again in……

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