Dev Frontend Performance Testing (Gate 6)

Overview

Ensure all frontend pages meet Core Web Vitals thresholds, achieve Lighthouse Performance > 90, maintain bundle size within budget, and minimize client component usage.

Core principle: Performance is a feature. Users on slow devices and connections deserve a fast experience. Performance budgets are enforced, not suggested.

<block_condition>

• LCP > 2.5s on any page = FAIL
• CLS > 0.1 on any page = FAIL
• INP > 200ms on any page = FAIL
• Lighthouse Performance < 90 = FAIL
• Bundle size increase > 10% without justification = FAIL </block_condition>

CRITICAL: Role Clarification

This skill ORCHESTRATES. Frontend QA Analyst Agent (performance mode) EXECUTES.