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THIS IS A FAST, COOKIELESS DOMAIN INTENDED FOR STATIC CONTENT DELIVERED TO THE
STACK EXCHANGE FAMILY OF WEBSITES




YAHOO BEST PRACTICES FOR SPEEDING UP YOUR WEB SITE

Use Cookie-free Domains for Components



> When the browser makes a request for a static image and sends cookies together
> with the request, the server doesn't have any use for those cookies. So they
> only create network traffic for no good reason. You should make sure static
> components are requested with cookie-free requests. Create a subdomain and
> host all your static components there.
> 
> If your domain is www.example.org, you can host your static components on
> static.example.org. However, if you've already set cookies on the top-level
> domain example.org as opposed to www.example.org, then all the requests to
> static.example.org will include those cookies. In this case, you can buy a
> whole new domain, host your static components there, and keep this domain
> cookie-free. Yahoo! uses yimg.com, YouTube uses ytimg.com, Amazon uses
> images-amazon.com and so on.
> 
> Another benefit of hosting static components on a cookie-free domain is that
> some proxies might refuse to cache the components that are requested with
> cookies. On a related note, if you wonder if you should use example.org or
> www.example.org for your home page, consider the cookie impact. Omitting www
> leaves you no choice but to write cookies to *.example.org, so for performance
> reasons it's best to use the www subdomain and write the cookies to that
> subdomain.