Woocommerce categories/subcategories slow down

Hi, We have upload around 10k products in our woocommerce shop, but the categories and subcategories started slow down. We had optimized the site with scores up to 92-80 gtmetrix and 76-92 google insights and the load time doesn't improve. Also some categories that has less products and attributes and the load time is the same like the categories that has more products and attributes.. We have optimized images using smush pro and still we don't see improve in those areas. We have AWS [login to view URL] instance that is pretty good server and CDN. We think the issue is related to woocommerce code performance. Only bit of you have strong experience with large woocommerce stores. Thanks in advance!