Dear sir,
1. This is didn't make by this widget, we only change widget style to display, you can save this configuration, then try to remove this widget to test this issue. But I think this issue made by your server, when we test your site in other places, load time are different:
tools.pingdom.com/#!/dJ0eq/
www.bestofventes.com/
2. Please change in admin site Pages: your contact page
3,4. Brands and testimonials: You can refer them in our guide:
www.smartaddons.com/wp_documentation/sw-shoppystore/#theme-config
5. This is our icon images, you can see them in file: wp-content/themes/shoppystore/assets/img/add1.png
6. Visual composer and slider are commercial plugins, if you want to update you need to buy them. Or you can update them when we update new version of the theme and plugins
Thanks.