Should I put images on a subdomain to speed up website loading?

Question

I read somewhere that browsers can only send a few concurrent request to resources on a domain. So if we split the resources across subdomains or may be domains .. will it speed up things?

Did you experiment something like this? What were the results or issues if any?

Answer 1

It definitely helps, but first start with css sprites. Also keep in mind that every additional domain will require DNS request and therefore slows-down!

Look at this great introduction on Yahoo: Performance Research, Part 4: Maximizing Parallel Downloads in the Carpool Lane

Answer 2

If you are using cookies, then I would use another domain and have it setup not to accept any cookies. You could do this with css and javascript aswell.

http://sstatic.net/