You're not alone if you start to feel stressed when your internet connection starts chugging along. A report from mobile broadband company Ericsson indicates that slow internet speeds do cause stress.
The study found that a person's heart rate can increase by around 38% as a result of mobile content delays. Meanwhile, the level of stress caused by mobile delays was comparable to that caused by watching a horror movie. It may be wise to avoid watching a horror movie on mobile...
As for that buffering wheel on YouTube, that can cause a fair degree of stress too. The study found that a two second delay in a YouTube video starting increases stress by three percentage points, while just a single pause as a video is playing can cause stress levels to rise by an additional fifteen percentage points.
We're doomed if we ever end up regressing to the good old days of 56K internet connections.