Hello,
Please, numerate your questions to avoid misunderstanding.
1) I checked the pagespeed report and it displays good results https://gyazo.com/b1c60e65a501d94c8d8441879636a4ad
You can disable Ajax add to cart in Theme Settings > WooCommerce > Single product if you are talking about this. Other Ajax requests (for the lazy loading for example) do not slow down the site speed but speed that up instead. You can disable Revolution slider plugin if you don’t use that or replace that with any other slider plugin if you think that it slows down your site a lot.
2) Could you, please, provide us with a link to the variable product that you tested and faced issues with that?
Could you, please, clear the CDN cache before that?
Regards