Msg#: 3647150 posted 10:31 am on May 11, 2008 (gmt 0)
The reason is that the subdomain may be hosted on a server that has limitless space and bandwith, say for big file images or video. The main domain being on a another server say in a country adventageous for serving the actual audience. Think SEO etc. It sounds like a good scheme and I was about to ask a question on the best way to set up such an arrangement in terms of DNS etc.
Msg#: 3647150 posted 3:35 pm on May 11, 2008 (gmt 0)
One reason is it will speed up load times for the page for people with faster connections. A browser will only send out X amount of requests to a domain and won't make any others until those have been filled. Since a sub-domain is considered a separate domain it will download the HTML, css files, .js or whatever else you may have from the main domain while simultaneously downloading the images from the sub domain.