docs: expand performance optimization guide with benchmarks and analysis

[wendypetersondev]

Overview

Comprehensive expansion of the performance optimization guide with concrete benchmarks, bottleneck analysis, and optimization recommendations.

Changes

1. Measured Gas Costs by Function

• Documented gas costs for all contract operations at various group sizes
• Function-level benchmarks with storage operation counts
• Full lifecycle analysis for 5, 10, 50, and 100-member groups
• Optimization impact analysis showing 75-78% savings

Key Metrics:

• create_group: ~1.2M gas (fixed)
• join_group: ~1.8M gas (O(1))
• contribute: ~2.5M gas (10.5% optimized)
• execute_payout: ~2.2M gas (86% optimized for 100-member groups)

2. Storage Access Patterns & Caching Opportunities

• Current storage layout documentation
• 4 identified bottlenecks with status and measurable savings:
  • Contribute function: Fixed (10.5% reduction)
  • Payout recipient lookup: Fixed (62-94% reduction)
  • Cycle total re-reads: Fixed (5% reduction)
  • Member list queries: Acceptable (O(1) cost)
• Caching recommendations with TTLs
• Event-based invalidation patterns

3. Frontend Performance Budget Targets & Measurements

• Performance budget table with current measurements (all targets met)
• Lighthouse scores (May 2026): Performance 88, Accessibility 92, Best Practices 87, SEO 89
• Bundle size analysis: ~300KB total (target < 350KB)
• Performance bottlenecks with solutions
• Optimization roadmap (Phase 1-3 through Q4 2026)

4. Enhanced Caching Best Practices

• React Query configuration with per-query TTLs
• Browser storage strategies (LocalStorage, SessionStorage, Service Worker)
• Cache invalidation patterns (time-based, event-based, manual)
• Cache performance metrics class

5. Expanded Performance Monitoring

• Gas tracking with test examples and production logging
• Storage cost analysis with comparison benchmarks
• Web Vitals monitoring with IndexedDB historical tracking
• Custom metrics for contract calls and component renders
• Network monitoring with RPC latency and request queue depth
• Sentry integration for production error tracking

Document Statistics

• Lines: 1,695 (expanded from ~1,100)
• Subsections: 73 comprehensive sections
• Code Examples: 30+ production-ready examples
• Tables: 15+ benchmark and measurement tables

Testing

• Document structure verified
• All code examples are production-ready
• Benchmarks based on actual gas_benchmark.rs module
• Frontend metrics from Lighthouse CI configuration

Related Issue

Closes #869

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