Summary

Solmate's implementation of the libraries used on the protocol are more optimized saving gas to the user.
The changes on the gas consumption could be seen below:

Test result: ok. 25 passed; 0 failed; 0 skipped; finished in 118.07ms
testSameSaltReverts() (gas: -3184 (-0.000%))
testConstructorBuyerZeroReverts() (gas: -109 (-0.184%))
testConstructorTokenZeroReverts() (gas: -109 (-0.185%))
testRevertsIfTokenTxFails() (gas: -6468 (-0.857%))
testRevertIfFeeGreaterThanPrice() (gas: -1472 (-1.044%))
testSellerZeroReverts() (gas: -1472 (-1.049%))
testConfirmReceiptRevertsOnTokenTxFail() (gas: -109687 (-7.714%))
testResolveDisputeWithBuyerAward() (gas: -103808 (-12.229%))
testResolveDisputeTransfersTokens() (gas: -103808 (-12.235%))
testResolveDisputeZeroSellerTransfer() (gas: -103208 (-12.866%))
testResolveDisputeChangesState() (gas: -103201 (-12.934%))
testCanOnlyResolveInDisputedState() (gas: -102569 (-13.244%))
testCanOnlyConfirmInCreatedState() (gas: -102561 (-13.363%))
testCanOnlyInitiateDisputeInConfirmedState() (gas: -102575 (-13.384%))
testTransfersTokenOutOfContract() (gas: -102575 (-13.386%))
testResolveDisputeFeeExceedsBalance() (gas: -101977 (-13.386%))
testConfirmReceiptEmitsEvent() (gas: -102575 (-13.395%))
testStateChangesOnConfirmedReceipt() (gas: -102575 (-13.397%))
testCreatingEscrowEmitsEvent() (gas: -103830 (-13.408%))
testInitiateDisputeEmitsEvent() (gas: -101974 (-13.436%))
testInitiateDisputeChangesState() (gas: -101974 (-13.449%))
testCreatingEscrowHasBuyerActuallyBeBuyer() (gas: -101974 (-13.533%))
testComputedAddressEqualsDeployedAddress() (gas: -102511 (-13.583%))
testDeployEscrowFromFactory() (gas: -101974 (-13.818%))
testOnlyArbiterCanCallResolveDispute(address) (gas: -101974 (-13.822%))
testInitiateDisputeWithoutArbiterReverts() (gas: -101974 (-13.838%))
testConfirmReceiptOnlyByBuyer() (gas: -101976 (-13.853%))
testOnlyBuyerOrSellerCanCallinitiateDispute(address) (gas: -101974 (-13.867%))
testConfirmReceiptOnlyByBuyerFuzz(address) (gas: -101975 (-13.874%))
testTokenZeroReverts() (gas: 55174 (234.056%))
Overall gas change: -2322869

Impact

Tools Used

Manual Review

Recommendations

Change OZ to Solmate on every file.