# Velodrome Gas Optimization **Use ++ i instead of i++ to Save Gas** *When using `i++` this uses more gas since Solidity 0.8.0 due to the way the compiler handles incrementing in safemath. This is less efficient than using `++i` which uses less gas because of how Solidity implements Safemath, even they though both accomplish the same thing within a for loop. The following lines' use of `i++` can be replaced with `++i`.* For example, take line 57 (Minter.sol) which utilizes ```i++``` which can be made more efficient with the use of ```++i``` instead ```Minter.sol= [line57] for (uint i = 0; i < claimants.length; i++) ``` alter this to ```Minter.sol= [line 57] for (uint i = 0; i < claimants.length; ++i) ``` There are many for loops through the code, so using ++i can add up substantially in gas. Replace `i++` with `++i` in the following lines. #### Gauge.sol Changes are reccomended on lines 179, 353, 405, 426, 448, 484 [Line 179](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Gauge.sol#L179) - change the `i++` in `for (uint i = 0; i < numRewards; i++)` to `++i` [Line 353](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Gauge.sol#L353) - change the `i++` in `for (uint i = 0; i < tokens.length; i++)` to `++i` [Line 405](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Gauge.sol#L405)- change the `i++` in `for (uint i = _startIndex; i < _endIndex; i++)` to `++i` [Line 426](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Gauge.sol#L426) - change the `i++` in `for (uint i; i < [ength; i++)` to `i++` [Line 448](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Gauge.sol#L448) - change the `i++` in `for (uint i = _startIndex; i < _endIndex; i++)` to `++i` [Line 484](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Gauge.sol#L484) - change the `i++` in `for (uint i = _startIndex; i < _endIndex; i++)` to `++i` #### Pair.sol Changes are recommended on lines 257, 389 [Line 257](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Pair.sol#L257) - change the `i++` in `for (uint i = 0; i < _prices.length; i++)` to `++i` [Line 389](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Pair.sol#L389) - change the `i++` in `[line389] for (uint i = 0; i < 255; i++)` to `++i` #### Rewards Distributor.sol Changes are recommended on lines 75, 105, 121, 148, 195, 252, 301 [Line 75](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/RewardsDistributor.sol#L75) - change the `i++` in `for (uint i = 0; i < 20; i++)` to `++i` [Line 105](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/RewardsDistributor.sol#L105) - change the `i++` in `for (uint i = 0; i < 128; i++)` [Line 121](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/RewardsDistributor.sol#L121) - change the `i++` in `for (uint i = 0; i < 128; i++)` to `++i` [Line 148](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/RewardsDistributor.sol#L148) - change the `i++` in`for (uint i = 0; i < 20; i++)` to `++i` [Line 195](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/RewardsDistributor.sol#L195) - change the `i++` in `for (uint i = 0; i < 50; i++` to `++i` [Line 252](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/RewardsDistributor.sol#L252) - change the `i++` in `for (uint i = 0; i < 50; i++` to `++i` [Line 301](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/RewardsDistributor.sol#L301) - change the `i++` in `for (uint i = 0; i < _tokenIds.length; i++)` to `++i` #### Router.sol Changes are recommended on lines 90, 316 [Line 90](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Router.sol#L90) - change the `i++` in `for (uint i = 0; i < routes.length; i++)` to `++i` [Line 316](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Router.sol#L316) - change the `i++` in `for (uint i = 0; i < routes.length; i++)` to `++i` #### VelodromeLibrary.sol Changes are recommmended on line 24 [Line 24](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/VelodromeLibrary.sol#L24) - change the `i++` in `for (uint i = 0; i < 255; i++)` to `++i` #### Voter.sol Changes are recommended on lines 76, 103, 128, 143, 147, 266, 272, 304, 310, 340, 346 [Line 76](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Voter.sol#L76) - change the `i++` in `for (uint i = 0; i < _tokens.length; i++)` to `++i` [Line 103](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Voter.sol#L103) - change the `i++` in `for (uint i = 0; i < _poolVoteCnt; i++)` to `++i` [Line 128](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Voter.sol#L128) - change the `i++` in `for (uint i = 0; i < _poolCnt; i++)` to `++i` [Line 143](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Voter.sol#L143) - change the `i++` in `for (uint i = 0; i < _poolCnt; i++)` to `++i` [Line 147](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Voter.sol#L147) - change the `i++` in `for (uint i = 0; i < _poolCnt; i++)` to `++i` [Line 266]((https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Voter.sol#L266) - change the `i++` in `for (uint i = 0; i < _gauges.length; i++)` to `++i` [Line 272](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Voter.sol#L272) - change the `i++` in `for(uint i = start; i < end; i++)` to `++i` [Line 304](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Voter.sol#L304) - change the `i++` in `for (uint i = 0; i < _gauges.length; i++)` to `++i` [Line 310](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Voter.sol#L310) - change the `i++` in `for (uint i = 0; i < _gauges.length; i++)` to `++i` [Line 340]((https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Voter.sol#L340)) - change the `i++` in `for (uint x = start; x < finish; x++)` to `++i` [Line 346](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/Voter.sol#L346) - change the `i++` in `for (uint x = 0; x < _gauges.length; x++)` to `++i` #### Voting Escrow.sol Changes are recommended on lines 1146, 1193, 1125, 1249, 1295, 1320, 1325 [Line 1146](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/VotingEscrow.sol#L1146) - change the `i++` in `for (uint i = 0; i < _tokenIds.length; i++)` to `++i` [Line 1193](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/VotingEscrow.sol#L1193) - change the `i++` in `for (uint i = 0; i < _tokenIds.length; i++)` to `++i` [Line 1225](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/VotingEscrow.sol#L1225)- change the `i++` in `for (uint i = 0; i < srcRepOld.length; i++)` to `++i` [Line 1249](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/VotingEscrow.sol#L1249) - change the `i++` in `for (uint i = 0; i < dstRepOld.length; i++)` to `++i` [Line 1295](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/VotingEscrow.sol#L1295)- change the `i++` in `for (uint i = 0; i < srcRepOld.length; i++)` to `++i` [Line 1320](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/VotingEscrow.sol#L1320)- change the `i++` in `for (uint i = 0; i < dstRepOld.length; i++)` to `++i` [Line 1325](https://github.com/code-423n4/2022-05-velodrome/blob/main/contracts/contracts/VotingEscrow.sol#L1325) - change the `i++` in `for (uint i = 0; i < ownerTokenCount; i++)` to `++i` *footnote - consider declaring all public functions as payable as it shouldn't interfere with any functionality, but will remove a 5 gas runtime check for each call.*

ControlCplusControlV