Blur Exchange contest - Awesome's results

Remove Shorthand Addition/Subtraction Assignment

Instead of using the shorthand of addition/subtraction assignment operators (+=, -=) it costs less to remove the shorthand (x += y same as x = x+y) saves ~22 gas

There are 6 instances of this issue:

Line 316, Line 601, Line 74, Line 574, Line 46, Line 73

Functions With Access Control Cheaper if Payable

A function with access control marked as payable will be cheaper for legitimate callers: the compiler removes checks for msg.value, saving approximately 20 gas per function call.

There are 2 instances of this issue:

Line 56-66, Line 323-352

Caching Storage Variables in Memory To Save Gas

Anytime you are reading from storage more than once, it is cheaper in gas cost to cache the variable in memory: a SLOAD cost 100gas, while MLOAD and MSTORE cost 3 gas.

Gas savings: at least 97 gas.

There is 1 instance of this issue:

Line 543-551

Function Order Affects Gas Consumption

public/external function names and public member variable names can be optimized to save gas. See this link for an example of how it works. Below are the interfaces/abstract contracts that can be optimized so that the most frequently-called functions use the least amount of gas possible during method lookup. Method IDs that have two leading zero bytes can save 128 gas each during deployment, and renaming functions to have lower method IDs will save 22 gas per call, per sorted position shifted