spontaneous addition to the cart

[Studio 42]

I dont know all plugin you load, but even your new site is to slow !
1.14s for HTML only is to slow for a so simple page.
My shop HTML is rendered in 300ms(sometime slower because server setting)
The first to do, is to find why Joomla && your server need so man time to render the HTML.
Try to enable Joomla debug to find the DB slow queries.
CSS optimisation is the next job, but your image are really big too ! 84KB for the logo can certainly be optimized on my website the max image thumb weight is perhaps 10kb

[GJC Web Design]

25 requests |  816.82 kB 

I know a long way from finished but u see the huge difference in server load compared to

108 requests / 4.70 MB

which wasn't even loading VM

server still seems a bit slow though  - 1.28sec to first bit...