B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
39%
39% -- task completion time increase for Websites with hidden navigation (2026)
Task completion slowed by at least 39% when primary navigation was hidden behind a hamburger menu on desktop.
- Slowed by at least 39%
- Specifically tested hiding primary navigation behind a hamburger menu on desktop compared to fully visible navigation
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
39%
Unit
Percentage
Data Vintage
2026
Entity
Sample Size
179
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Nielsen Norman Group
Primary
Tier B
https://mybworkshops.com.au/why-websites-need-clear-navigation-to-convert-visitors/ ↗
Source Article
Why websites need clear navigation to convert visitors
Clear navigation is the foundation of an effective website. Without it, visitors cannot find what they need, and your business pays the price in lost leads and lower sales. Whether you run a service business or an online shop, the structure of your site menus directly shapes how long visitors stay, …
Original Research
Nielsen Norman Group
· Original study ↗
Methodology
Nielsen Norman Group usability testing
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Websites with hidden navigation: 39% task completion time increase. Source: Nielsen Norman Group (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/hidden-nav-task-completion-slow-39pct
HTML Embed
<blockquote cite="https://lighthousedata.io/data/hidden-nav-task-completion-slow-39pct" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>39%</strong> -- task completion time increase for Websites with hidden navigation<br><small>Source: Nielsen Norman Group (2026) · <a href="https://lighthousedata.io/data/hidden-nav-task-completion-slow-39pct" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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