Same problem here Alberto. A site I developed using WP Ecommerce takes between 5 and 35 seconds to load with WP Ecommerce activated and between 682 and 800 milliseconds to load when the plugin is deactivated. This applies specifically to tests done on the homepage where very few images are loaded and very little WP Ecommerce functionality is needed (apart from the shopping cart). There are however, an extremely large number of products captured in the database, 8000+.
* WordPress 3.6.1
* WP Ecommerce 3.8.12.1
Any advise would be much appreciated!
Gareth
Having worked on speeding up various websites, both wp-e-commerce and other, I can say there is no “one size fits all” solution.
You need to investigate and then work on whichever area needs attention.
http://www.webpagetest.org/ is a great tool to start the analysis with.
Slow database queries are frequently a problem.
It helps if you are not on a shared host and can investigate closely. Sometimes there is no query cache configured – that doesn’t help.
Sometimes it’s not wp-e-commerce itself, but a plugin that has a poor SQL query; or it’s a theme that’s causing thousands of database queries; or an image plugin that’s repeatedly creating and destroying the same thumbnails; or….
