Could someone tell me if there's a way to filter & stream the content of a different site directly to someone's browser (without redirecting the user to the other page)?

Right now, I'm accessing my friend's site, filtering the data, and putting his content on a part of my page. I'd like to know if there's a way to speed this up. Saving his files to my host and then sending the data out again is taking more processor power than I'd like to be using for this task.