Something is making my new ubuntu 12.10 cloud VPS very slow. Based on nginx + php-fpm, with prestashop 1.5.4 (+-600 products) installed, 1 visitor opening 1 page makes the cpu throttle to 100%.
In comparison: my prestashop [url removed, login to view] with the same amount of products hosted on the cheapest shared hosting plan just had 50 visitors at one point with seemingly no delay on the website.
This is the website: [url removed, login to view]
I want to know what is wrong here and how i can fix it.