Solve small problems on website -- 2

We need to take care of the following matters: - Loading speed: each time any of the options is clicked, it takes about 10 seconds for the site to load the content - Search at the top: When we click to search, the message "This form is not secure. Auto-complete has been disabled" appears. - Search engine at the bottom: it is not complete and, if we click on it several times, it allows us to enter the name of the product, but the box shrinks - Buttons: "Shopping guarantee" and "Offers" do not perform any action. It should make them redirect to a page with content or remove them - Mobile: it can be difficult to use your page on mobile devices Our website is www.notebookmundo.cl and is made with presta shop