CSS Sprites - CDN
Using CSS sprites to reduce http requests, css and image blocks be updated for all the basics, with speed on google the new addon this feature is highly essential,
Modify the configuration file to allow images be served from a seperate server, ie
the images folder server off a seperate server,
but the files serverd locally for https
MaxCDN is easy to use and it is cheap if we compare with Amazon
Stephen Nutley commented
It needs amazon S3 support,
https should all serve off www domain,
http off mixed domains e.g.
Also, CDN might trigger partial SSL pages with mixed content. Some items that are loaded from your server are SSL-ed but from CDN are not. IE users will get that annoying notice that their SSL session is partial, mixed. So, CDN should be implemented very carefully.
configuration setting for separate domain for product images will be really useful. It will help in simultaneous http request so will increase site performance.