Due to the way WooCommerce is built, it is loading its assets on every single piece of content on your website. That obviously is not ideal when you're striving to build a fast-loading Woo website.
Therefore, I've recorded this quick screencast and given you this code example to fix the issue of WooCommerce loading unused CSS/JS files. You can open the code snippet on Github here: https://gist.github.com/jan-koch/544f858ae37e63ddf161243062f308fe
Please test this code on a staging website before adding it to the theme's functions.php on your production website!
Due to the variety of WordPress themes and plugins (and since I don't know how your site is built), the code might cause unwanted side effects.
Obviously, I've tested the code snippet and - as you can see in the video - it is working on my example website.
If you have any issues with the code, please get in touch with me. The best way to do that is to leave a comment on the YouTube video or join my FB group called WP Mastery.