Speed-Comprehension Trade-off

An empirical pattern in readability research: typographic, layout, and presentation choices that increase reading speed often reduce comprehension accuracy, and vice versa. For example, sans-serif faces and shorter line lengths tend to support faster reading but may yield lower accuracy on comprehension questions, while serif faces or denser presentations slow reading down but can produce better recall. The trade-off is not universal - individual readers, content type, and task demands all modulate it - but it implies that 'optimal' typography is task- and reader-specific. For accessibility practitioners this means defaulting to a single readability-optimized typography may underserve users with ADHD, dyslexia, or low vision whose preferred trade-off differs from the general population's; user-controlled customization is the more defensible design stance.