Some people may be on mobile devices, but obviously it isn't the articles that is taking to long to load. It is the layers and layers of blocking JavaScript used for tracking and serving up ads that are taking forever to load.
I think Slate is the most egregious offender there.
What? In my experience this has always been true on mobile. If something takes longer than a few seconds to load it gets closed or restarted.
How many news articles take longer than a few seconds to load?
Many.
Through Facebook's in-app browser? Most. And you must at least start the load in the in-app browser to get the option to open it in the device's native browser.