Many product variants

Hi, I have a dozen of products and some come to around 10,000 variants.
I use this plugin “WooCommerce Variation Swatches – Pro” and I entered this code in functions.php because I read that woocommerce as a setting of up to 30 variants and otherwise before I could select a variant I had to wait many more seconds.

add_filter (‘woocommerce_ajax_variation_threshold’, ‘wc_ninja_ajax_threshold’);
function wc_ninja_ajax_threshold () {
return 10200;
}

But now the loading of the pages is really very slow. I have already installed a plugin to try to speed up the site (WP-Rocket) but things do not change.

I tried to find a solution on internet, but I can’t find anything that can help me.

Can anyone give me some advice on how to solve it?
Thanks in advance