Failure class
Layout shift or slow on 3G
Content jumps as it loads, or key steps take many seconds on slow networks.
Who it hits
Vision agents click the wrong element; low-bandwidth personas abandon.
How to fix it
- Reserve space for late content.
- Keep key steps under 2.5 s LCP on mobile.
How alt.qa detects it
We tag a finding as “Layout shift or slow on 3G” when the trace shows this pattern at the blocking step. It only becomes a ticket once it is Confirmed (reproduced in two or more cells or by replay), and we show which personas and agents it hit.
In an Alt Matrix
Look for the pattern: a failing column usually means an agent-class problem; a failing row a persona problem; the same step failing in three or more cells a product bug.
See where agents fail on your funnel.
Run one free cell on a property you own. No sales call, no card.