We would tweak your website and optimize speed of loading a single product page by doing following tasks:

• Update your theme to an optimize version and reduce your unnecessary plugins for better performance its better to keep page size under 600kb usually it’s because of theme or the plugin used in website.
• Making sure that the generated HTML / CSS is valid and compress javascript, stylesheet.
• Optimize Ubermenu and WPML plugins by removing caching.
• Install WP-Optimize to clean up and optimize website database