I can see you're trying to use high-def images so the site doesn't appear blurred on Retina devices, however those images shouldn't load when I'm not on a Reti

I can see you're trying to use high-def images so the site doesn't appear blurred on Retina devices, however those images shouldn't load when I'm not on a Retina device. Try resizing the window in Chrome and notice the navigation images become jaggy. The resize algorithm switches temporarily for performance reasons. There's also the fact the having bigger images only to resize them down wastes bandwidth and makes them appear slightly blurry. Check "srcset". It's supported by more and more browser (including the upcoming Safari 8).