Navigation latency

Skill nexus-labs-automation/mobile-observability/skills/navigation-latency

Measure time from navigation tap to screen fully loaded and interactive. Use when tracking screen transitions, deep links, or tab switches.From its SKILL.md

Install

npx -y skills add nexus-labs-automation/mobile-observability --skill navigation-latency

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SKILL.md

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Navigation Latency

Time from tap to destination screen interactive (TTI).

Phases

TAP → TRANSITION → VIEW_INIT → DATA_LOAD → INTERACTIVE
     |_____________________________________________|
                   Navigation Latency

When to Use

Tab bar taps
List item → detail screen
Deep link → target screen
Any screen-to-screen transition

Key Thresholds

Rating	Duration
Good	<400ms
Acceptable	<1s
Poor	>1s

Measurement Points

onNavigationStart - user taps (source screen)
onViewAppear - destination view visible
onContentReady - data loaded, interactive

Implementation

See references/ui-performance.md (Navigation Latency section) for:

iOS: NavigationLatencyTracker with os_signpost
Android: Fragment/Activity lifecycle hooks
React Native: React Navigation listeners

Common Mistakes

Measuring only view appear (missing data load)
Not correlating source → destination
Ignoring warm vs cold screen loads

Related Skills

See skills/interaction-latency for button/tap response times (vs full screen loads)
Combine with skills/user-journey-tracking to correlate navigation with user intent