turash/bugulma/frontend/MEMOIZATION_AUDIT.md

Memoization Audit - Complete Review

Summary

This document details all memoization optimizations applied across the codebase to prevent unnecessary re-renders and improve performance.

Components with React.memo Added

Organization Components

• ✅ OrganizationContent - Memoized with useCallback for handlers and useMemo for ai props
• ✅ ProposalList - Memoized with useMemo for arrays and useCallback for functions
• ✅ ResourceFlowList - Memoized with useMemo for filtered flows
• ✅ ResourceFlowCard - Memoized
• ✅ KeyMetrics - Memoized
• ✅ ContactDetails - Memoized
• ✅ ContactInfoLine - Memoized
• ✅ AIAnalysisTab - Memoized
• ✅ WebIntelTab - Memoized
• ✅ IntelligenceModule - Memoized
• ✅ CreateProposalModal - Memoized with useCallback

Map Components

• ✅ SidebarContent - Memoized
• ✅ SidebarPreview - Memoized with useMemo for sector map
• ✅ SearchSuggestions - Memoized
• ✅ HistoricalContextAI - Memoized with useCallback

Matches Components

• ✅ MatchesList - Memoized
• ✅ MatchCard - Memoized

User Components

• ✅ MyOrganizations - Memoized with useMemo for sector map

Admin Components

• ✅ DashboardStats - Memoized
• ✅ StatCard - Memoized
• ✅ SupplyChainAnalysis - Memoized with useMemo for arrays and ResourceList
• ✅ EconomicGraph - Memoized with useMemo for node map and useCallback for findNode
• ✅ OrganizationTable - Memoized

Chatbot Components

• ✅ ChatHistory - Memoized
• ✅ ChatInput - Memoized with useCallback
• ✅ TypingIndicator - Memoized
• ✅ MarkdownRenderer - Already had useMemo, added React.memo

Form Components

• ✅ Step1 - Added useMemo for translatedSectors

Hooks Optimized

useDirectSymbiosis

• ✅ Added useMemo for organization map (O(1) lookup instead of O(n) find)
• ✅ Memoized providers and consumers arrays

useI18n

• ✅ Memoized Intl.PluralRules to avoid recreation
• ✅ Optimized regex creation in translation replacement

useOrganizationFilter

• ✅ Already had useMemo, added safe array checks

Key Optimizations Applied

1. React.memo for Components

Components that receive props and don't need to re-render when parent state changes are wrapped in React.memo.

2. useMemo for Expensive Calculations

• Array filtering/mapping operations
• Object/Map creation
• Sector/organization lookups
• Translated data

3. useCallback for Event Handlers

• onClick handlers
• Form submission handlers
• Status update handlers
• Navigation handlers

4. Map-Based Lookups

Replaced O(n) .find() operations with O(1) Map lookups:

• Sector lookups in MyOrganizations
• Sector lookups in SidebarPreview
• Organization lookups in useDirectSymbiosis
• Node lookups in EconomicGraph

5. Memoized Object Props

• aiProps object in OrganizationContent to prevent PartnershipHub re-renders
• Filtered arrays in ResourceFlowList
• Proposal arrays in ProposalList

Performance Impact

Before Optimizations:

• Components re-rendered on every parent state change
• Arrays/objects recreated on every render
• O(n) lookups in render loops
• Event handlers recreated causing child re-renders

After Optimizations:

• Components only re-render when props actually change
• Expensive calculations cached with useMemo
• O(1) lookups instead of O(n) searches
• Stable event handlers prevent unnecessary child updates

Components Already Memoized (No Changes Needed)

These components were already properly memoized:

• OrganizationHeader
• OrganizationDetailsGrid
• OrganizationSidebar
• PartnershipHub
• SimilarOrganizations
• DirectMatchesDisplay
• DirectMatchesTab
• MatchCard (organization folder)
• ProposalCard
• HistoricalContextCard
• OrganizationMarkers
• HistoricalMarkers
• SymbiosisLines
• MapSidebar
• MapHeader
• MapFilters
• MapControls
• SidebarList
• TopBar
• Footer
• All landing page components
• All heritage components

Best Practices Applied

1. Memoize components that receive props - Prevents re-renders when parent state changes
2. Memoize expensive calculations - useMemo for arrays, objects, maps
3. Memoize event handlers - useCallback to prevent child re-renders
4. Use Map for lookups - O(1) instead of O(n) for repeated lookups
5. Memoize object props - Prevents child re-renders from new object references

Testing Recommendations

1. Use React DevTools Profiler to verify re-render reduction
2. Monitor component render counts in development
3. Test with large datasets to see performance improvements
4. Verify no functionality broken by memoization

Future Considerations

1. Consider React.lazy for code splitting large components
2. Virtual scrolling for long lists (SidebarList, MatchesList)
3. Suspense boundaries for async components
4. Web Workers for heavy calculations (graph generation, filtering)