Google chrome is about 53 megabytes. Google chrome is very lightweight compared to internet explorer or mozilla firefox. I'd highly recommend it if you think your current internet browser is slow. I'm currently using it because I'm on a small netbook which is not that fast, but google chrome browses the web as fast as I'd want to.
If you want to download it, go on google and type in "download google chrome", it should be the first link.
I hope I've helped! (: