FactoryDAO contest - Waze's results

#1 https://github.com/code-423n4/2022-05-factorydao/blob/db415804c06143d8af6880bc4cda7222e5463c0e/contracts/FixedPricePassThruGate.sol#L53

https://github.com/code-423n4/2022-05-factorydao/blob/db415804c06143d8af6880bc4cda7222e5463c0e/contracts/SpeedBumpPriceGate.sol#L79

(bool sent, bytes memory data) = ... you can change to (bool sent, ) = ... because it is a local variable which does not have to declared at all. It makes gas fee cheaper than you use (bool sent, bytes memory data) = ...

#2 https://github.com/code-423n4/2022-05-factorydao/blob/db415804c06143d8af6880bc4cda7222e5463c0e/contracts/MerkleResistor.sol#L59

precision is a constant. to reduce gas fee i suggest changing the visibility from public to internal or private.

#3 https://github.com/code-423n4/2022-05-factorydao/blob/db415804c06143d8af6880bc4cda7222e5463c0e/contracts/MerkleResistor.sol#L175

!= 0 more efficient than > 0. !=0 cheaper cost gas if compare with >0 for unsigned integers in require statements. gas optimizer must be enabled

#4 https://github.com/code-423n4/2022-05-factorydao/blob/db415804c06143d8af6880bc4cda7222e5463c0e/contracts/PermissionlessBasicPoolFactory.sol#L115

https://github.com/code-423n4/2022-05-factorydao/blob/db415804c06143d8af6880bc4cda7222e5463c0e/contracts/PermissionlessBasicPoolFactory.sol#L141

https://github.com/code-423n4/2022-05-factorydao/blob/db415804c06143d8af6880bc4cda7222e5463c0e/contracts/PermissionlessBasicPoolFactory.sol#L168

https://github.com/code-423n4/2022-05-factorydao/blob/db415804c06143d8af6880bc4cda7222e5463c0e/contracts/PermissionlessBasicPoolFactory.sol#L224

https://github.com/code-423n4/2022-05-factorydao/blob/db415804c06143d8af6880bc4cda7222e5463c0e/contracts/PermissionlessBasicPoolFactory.sol#L249

https://github.com/code-423n4/2022-05-factorydao/blob/db415804c06143d8af6880bc4cda7222e5463c0e/contracts/PermissionlessBasicPoolFactory.sol#L266

uint i = 0, i suggest changing to uint i; becasuse default value of uint is 0. ++i is cheaper cost gas than i++ or i += 1 for unsigned integer, as pre-increment.