Product Filter Took 5-6 Seconds to load after page load

Hi there,

My shop uses the filter plugin to do filtering. Recently we noticed that the shop page took more than 10 seconds to load. But the initial 5-6 seconds it was used to load the filter then the product images will then follow suit.

Could you advise on this matter?

Thank you very much.

The page I need help with: [log in to see the link]