Website Performance
One of the many techniques available to aid web performance is to split content across several domains. I've used this on my property website at propquest.co.uk.
If you're using cookies, you can serve images from an unrelated domain, and avoid trying to serve up a cookie with each image request.
Similarly, static content, which could be css or javascript files can be located on their own domain also. Currently I have these served from pqimg.com - I use this for several sites so I can offload image delivery from the main websites themselves.
