Why does the woocommerce cart take a long time to update?

Question

WordPress

There is a problem with the site test3.kwins.ru
For some reason, adding an item to the cart freezes, and on the cart page, when it is updated, it takes a very long time to update. I can't figure out what could be the reason at all. Maybe someone faced a similar problem? Can you please tell me what are the possible solutions? If you need any details, then I will sign everything, until I even understand where to look for the problem.