Something useful to check would be if this slowness is happening in any other browsers. Try downloading Firefox and seeing if browsing is slow in that browser. If not, you at least know your problem is probably limited to Chrome.
I would try clearing all browsing history and cookies (and other information) in Chrome by pressing Ctrl+Shift+Delete and checking all of the options that appear. Also check to make sure that you didn't accidentally/inadvertently install any new addons.
Lastly, I would try disabling all of your addons and seeing if that helps, if it does you can start selectively turning them back on to figure out which one is causing the trouble, maybe one of them had a bad update!
PS: People have been complaining lately that the latest release of Chrome is having some issues. I have heard about crashes in particular but maybe the problems are manifesting themselves as slowness on your setup.