LayersTest.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "https://github.com/0xsequence/sstore2/contracts/SSTORE2.sol";


contract LayersTest is Ownable, ReentrancyGuard {

    struct Layer {
        string name;
        bytes hexString;
    }

    struct LayerInput {
        string name;
        bytes hexString;
        uint8 layerIndex;
        uint8 itemIndex;
    }
    
    uint256 private constant NUM_LAYERS = 9;

    mapping(uint256 => Layer) [NUM_LAYERS] layers;


  

    function setLayersOld(LayerInput[] calldata toSet) external onlyOwner { //2371714
        for (uint16 i; i < toSet.length; ++i) {
            layers[toSet[i].layerIndex][toSet[i].itemIndex] = Layer(toSet[i].name, toSet[i].hexString);
        }
    }

    function setLayers(LayerInput[] calldata toSet) external onlyOwner{ //1948537
        
        for (uint16 i; i < toSet.length; ++i) {
                
        (string memory name,bytes memory hexString, uint8 layerIndex,uint8 itemIndex)=
            abi.decode(
                SSTORE2.read(
                    SSTORE2.write(abi.encode(toSet[i].name, toSet[i].hexString,toSet[i].layerIndex,toSet[i].itemIndex))),
                    (string,bytes,uint8,uint8)
                );
            layers[layerIndex][itemIndex]=Layer(name,hexString);
            }
        }
}