Gas Optimizations

[code423n4]

withholdRatio and currentWithheldETH are already 0, avoid to set variables with 0

frxETHMinter.sol#L63-L64:

withholdRatio = 0; // No ETH is withheld initially
currentWithheldETH = 0;

withholdRatio and currentWithheldETH are already 0

Instead of numValidators() use validators.length

Save gas avoiding calling a view function on: OperatorRegistry.sol#L136 OperatorRegistry.sol#L182

Use != 0 on requires instead of >0 to save gas

On: frxETHMinter.sol#L79 frxETHMinter.sol#L126

Use ++iinstead of i++, ++i costs less gas than i++

On:

• ERC20PermitPermissionedMint.sol#L84

Instead of ++i/i++ you should use unchecked{++i}/unchecked{i++} (when its safe)

On;

• frxETHMinter.sol#L129
• OperatorRegistry.sol#L63
• OperatorRegistry.sol#L84
• OperatorRegistry.sol#L114
• ERC20/ERC20PermitPermissionedMint.sol#L84

Use this pattern;

for (uint256 i = 0; i < numDeposits;) {
  ... code
  unchecked{ ++i; }
}