An i3-2100 will show its age on taxing sites like dailydot. That site is basically a PC benchmark where you just scroll and look at how smooth it is (or isnt). Ebay searches with 200+ results also can be quite taxing. Certain video websites (ahem) seem to be getting more and more taxing on a cpu. If you are seeing lots of tiny scrolling stutters, even after the page has "loaded", then you might enjoy a cpu upgrade.