Magento 2 – Speed up product update attribute.

If need update product attribute at existing product normal way it will take much time to save. Example of usual code(take lot of time for saving):

protected $_productRepository;
....

public function __construct(    
....
\Magento\Catalog\Api\ProductRepositoryInterface $productRepository
....
){
   $this->_productRepository = $productRepository;
}

....
$product = $this->_productRepository->get($sku);
$product->setData('some_attribute', 'some value');
$this->_productRepository->save($product);

Example code for speed up product update attribute:

protected $_productRepository;
protected $_productResource;
....

public function __construct(    
....
\Magento\Catalog\Api\ProductRepositoryInterface $productRepository,
\Magento\Catalog\Model\ResourceModel\Product $productResource
....
){
   $this->_productRepository = $productRepository;
   $this->_productRepository = $productRepository; 
}

....
$product = $this->_productRepository->get($sku);
$product->setData('some_attribute', 'some value');
$this->_productResource->saveAttribute($product, 'some_attribute');

Script for testing speed:

<?php
use Magento\Framework\App\Bootstrap;
require __DIR__ . '/app/bootstrap.php';

$bootstrap = Bootstrap::create(BP, $_SERVER);
$objectManager = $bootstrap->getObjectManager();

$state = $objectManager->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');

$product_id = 4;

$product = $objectManager->get('Magento\Catalog\Model\Product')->load($product_id);

$start = microtime(true);

$productResource = $objectManager->create('\Magento\Catalog\Model\ResourceModel\Product');
$product->setName('new product name 1');
$productResource->saveAttribute($product, 'name');

echo "Save attribute duration: ".(microtime(true) - $start)." seconds\n";

$starttime = microtime(true);

$product->setName('new product name 2');
$product->save();

echo "Save product duration: ".(microtime(true) - $start)." seconds\n";

Resource – https://mage2-blog.com/magento-2-speed-up-product-save/