Remove WooCommerce scripts and styles.

woocommerce-remove-scripts-styles.php

<?php

/**
 * Remove WooCommerce scripts and styles.
 *
 * Cart fragments are used for things like ajax cart menu icons,
 * but it's really slow, so let's only keep them where necessary.
 *
 * @version 1.3.0
 * @author  Mike Hemberger @JiveDig
 * @link    https://gist.github.com/JiveDig/1466a6bb4b13bd80ab36f7ba4076a55b
 *
 * @return void
 */
add_action( 'wp_enqueue_scripts', function() {
	// Bail if WooCommerce is not active.
	if ( ! class_exists( 'WooCommerce' ) ) {
		return;
	}

	// Bail if on WooCommerce pages.
	if ( is_shop() || is_product() || is_cart() || is_checkout() || is_account_page() ) {
		return;
	}

	// Remove the generator tag.
	remove_action( 'wp_head', array( $GLOBALS['woocommerce'], 'generator' ) );

	$scripts = [
		'accounting',
		'wc-add-payment-method',
		'wc-lost-password',
		'wc-price-slider',
		'wc-single-product',
		'wc-add-to-cart',
		'wc-cart-fragments',
		'wc-credit-card-form',
		'wc-checkout',
		'wc-add-to-cart-variation',
		'wc-single-product',
		'wc-cart',
		'wc-chosen',
		'woocommerce',
		// 'prettyPhoto',
		// 'prettyPhoto-init',
		// 'jquery-blockui',
		// 'jquery-placeholder',
		// 'jquery-payment',
		// 'fancybox',
		// 'jqueryui',
	];

	$styles = [
		'woocommerce_frontend_styles',
		'woocommerce-general',
		'woocommerce-inline',
		'woocommerce-layout',
		'woocommerce-smallscreen',
		'woocommerce_fancybox_styles',
		'woocommerce_chosen_styles',
		'woocommerce_prettyPhoto_css',
		'wc-block-vendors-style',
		'wc-block-style',
		'printful-global', // printful-shipping-for-woocommerce
		'wcsatt-css', // woocommerce-all-products-for-subscriptins
		'wc-gateway-ppec-frontend', // woocommerce-gateway-paypal-express-checkout
		'wc-memberships-frontend', // woocommerce-memberships
		// 'select2',
	];

	foreach ( $scripts as $handle ) {
		wp_dequeue_script( $handle );
	}

	foreach ( $styles as $handle ) {
		wp_dequeue_style( $handle );
	}

}, 999 );

I should have been clearer, I am removing WC scripts & styles from all pages including WC pages (so much junk!), so these assets were being loaded on a product page. They get loaded by default on themes that havn't declared support for WC using add_theme_support('woocommerce');.

Thanks for the reference to Query Monitor by the way. I have no idea why I havn't come across this before, it looks so useful!