graeme_p - 9:30 am on Jun 4, 2013 (gmt 0)
When you are looking at websites, not only is the browser doing the same thing, but what it is doing most of the time is waiting for the network.
What I can say is that even "bloated" linux distros are not all that resource hungry. The slowest machine we have, a dual core Atom netbook with 2Gb of RAM, can run a standard Ubuntu install well enough for light use.
My latop (i5 with 4Gb) is very snappy running Ubuntu with the MATE desktop and rarely uses much more than 1Gb of RAM.