Why is there a slight lag between native apps and “desktop” apps?

So I'm not really sure how to explain this but I will try my best.

I created a jsfiddle: https://jsfiddle.net/xghar755/2/

As you quickly hover over each text, you can see that the background color changes. This is just a simple div with a css hover property. Here is the kicker though, go to your address bar and type in any letter and you get a drop down of items, like so.

http://i.stack.imgur.com/dgbaC.png

Now, quickly hover your mouse over the items in the dropdown. And then go back to the jsfiddle and hover your mouse over its items. You can tell that the chrome versions` background color feels more responsive. It's rarely noticable, but I can tell. Why is that?

Is this because Chrome's a Native application that doesn't rely on CSS and the DOM? If so, does this mean that native apps are generally more responsive in user interface applications? Thanks ~