I've been on the speed optimisation for a while now.

One of the suggestions is to parallelize downloads across multiple domains.

Basically I have loaded all my category images on virtuemart from a different domain taht I use to host all my images and static files.

The problem that I have now is that I cannot set a expiration time on these images.

The below is the result from pingdom

The following cacheable resources have a short freshness lifetime. Specify an expiration at least one week in the future for the following resources:

my URL is www.promotional-products.org/

Hi David, and welcome to OSTraining!

Honestly I didn't see any extension that could do this, but a professional here might see something I missed completely, however, I did run across a PHP script to create expiration times on images to cache your images in a Virtuemart extension.

You can find the following code here:
stackoverflow.com/questions/5316829/how-...cache-image-from-php

Let me know if this is something you were looking for. :-)