Bing News loads faster on WP then on Windows RT. Seriously, wtf?

I own a Windows Phone but I've only seen Windows RT demos.

I was always suspicious why the apps on RT (and also Atom Windows 8 tablets) take so long to load. Both WP and RT are running .NET applications, at almost the same resolution and same specs (if not in favor of RT).

And now that Bing News has came to WP, you can easily see my point, as the app is visually and functionally the same on both OS. WP is almost instantaneous (like all WP apps), while RT takes at least 3-4 seconds.

Why, FOR THE LOVE OF GOD, WHY???????