A potential client has a slow ecommerce site using Joomla/Virtuecart which takes 6-10 seconds for any page to load. I've seen faster solutions and would like to transfer the 4,000+ products with little hassle to a speedier, more full-featured open-source solution.

1. Is there a good way to transfer thousands of products between ecommerce programs (CSV file perhaps)?
2. What is a speedy PHP alternative to Virtuecart? Is Cubecart good?