[presumeaway]

I think I know why you're getting down-voted, but it's an interesting and real issue.

If you go a while, mostly digesting only tiny chunks of information, your brain optimizes around that and eventually becomes bad at dealing with longer narratives. (Aside: sometimes those narratives are worthwhile, other times they seem like they're just filler to make editors and publishers happy. But that's beside the point.)

It's also something we seem to be losing as a society.

The good news is, at least in my own experience, it's a skill we can develop (and it's closely related to attention span). When I buckle down and read complex texts for non-Internet periods of time (20-30 minutes), I quickly regain my speed and comprehension. But I find it important to deliberately exercise that part of my brain.