What is cognitive load and how can UI reduce it?

• A. Mental effort required to use a UI; reduce with heavy graphics.
• B. Cognitive load measures network latency.
• C. Mental effort required to use a UI; reduce with clarity, chunking, progressive disclosure, and consistent patterns.
• D. Cognitive load is how quickly a page loads.

Answer: (C)

Cognitive load is the mental effort a user must invest to perceive, interpret, and interact with a user interface. The goal is to ease that effort so tasks can be completed quickly and accurately. The best way to reduce cognitive load is to design for clarity in labels and instructions, present information in clear, manageable chunks, use progressive disclosure to show only what’s needed at each moment, and keep interaction patterns consistent so users can anticipate how controls will behave. These approaches minimize the mental work required, helping users understand the interface without being overwhelmed. Decorative or heavy graphics can actually add to the mental effort by distracting or forcing extra interpretation, so they don’t reduce cognitive load. Cognitive load focuses on mental effort, not network latency or page load speed.