My experience using tools to remove unnecessary / intrusive webpage elements (directly through the Element Inspector, via CSS managers such as Stylus, or the uBlock Origin element-blocking tool.

Even non-advertising elements such as social-media icons, related articles lists, sidebars, and the like. The more the display is limited to simply the text I intend to read, the less stress and distraction I feel.

Virtually all studies of multitasking show that multitaskers both overestimate their abilities and their performance is negatively affected by the attempt.

Ignoring intrusions is a task.