To ensure your sites runs as quick as possible we have teamed up with a Content Delivery Network leader. Basically this means your sites static content (ie images) is stored in different data centers around the world.
The benefit of this is that if a user comes to your site, they see the static content that is the closets to them. This reduces latency and dramatically speeds up your website.
There is a small issue of running a CDN
If you change a static image on your site is can take a while to filter through.