in order to maximize parallel download:
I would like to serve all the files stored in the /assets/ folder from a different hostname, like static.mywebsite.com (that points to the same host)
In few words I would like that all the articles containing links to the /assets/ folder, be rewritten from:
AFAIK links to assets aren't created using shortcodes, so no luck with that..
But you could still write a custom TextParser that replaces all links in your content.
The page about TextParser apparently no longer on doc.silverstripe.org, but just look at the implementations in sapphire/parsers