You can use the HTML-only version of Gmail at the bottom of the page which loads in 300 ms or so.
Gmail view: standard | >basic HTML< Gmail view: standard | >basic HTML<This is one of the reasons I use it. I get in, catch up, get the hell out of dodge (close the tab), and then I don't have (yet) a(nother) gmail tab sucking up literally hundreds of MB of RSS.