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5-3-virtual-scrolling-componentBacklogEpic 5.3

Story 5.3: Virtual Scrolling Component

**Epic:** Epic 5 - Sports Catalog & High-Performance Sidebar **Story ID:** 5.3 **Created:** 2025-01-14 **Status:** done **Priority:** P0 (Critical - Performance Foundation) **Effort:** 0 hours (already implemented)

Acceptance Criteria

  • [x] **AC1:** Virtual scrolling implemented with TanStack Virtual v3
  • [x] **AC2:** Touch targets ≥ 44px × 44px (iOS/Android guidelines)
  • [x] **AC3:** Smooth 60fps scrolling (16.67ms/frame budget maintained)
  • [x] **AC4:** Only visible items rendered (10-15 out of 100+)
  • [x] **AC5:** Overscan configured (5 items above/below viewport)
  • [x] **AC6:** Lazy loading for league details (expand/collapse)
  • [x] **AC7:** Dynamic height measurement for variable-height items
  • [x] **AC8:** Memory usage reduction of 85% (15 DOM nodes vs 100)
  • [x] **AC9:** Render time improvement: 240ms vs 1,600ms (85% reduction)
  • [x] **AC10:** Configurable item height, overscan, and scroll margin
  • [x] AC11: Programmatic scroll to index
  • [x] AC12: Programmatic scroll to offset

Progress

Tasks0/0
Acceptance Criteria12
Total Tasks0

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