Performance

[Sargis686]

Deploy:deply:https://sparkling-granita-1bae08.netlify.app/
Github:https://github.com/Sargis686/react-performance/pull/new/performance

Description

This PR improves the performance of the CO2 data application by optimizing React rendering and reducing unnecessary re-renders.

Implemented Optimizations

✅ CountryList

• Added useMemo for expensive data transformations
• Optimized filtering and sorting calculations
• Added virtualization using react-window
• Improved large list rendering performance

✅ CountryCard

• Added React.memo to prevent unnecessary component re-renders
• Optimized component updates when parent state changes

✅ App

• Optimized state updates and event handlers
• Improved data flow between components

Performance Improvements

• Reduced unnecessary renders
• Improved responsiveness when:
  • searching countries
  • sorting data
  • changing years
  • toggling columns

Checklist

• useMemo implemented
• useCallback implemented
• React.memo implemented
• Proper keys used
• Virtualization implemented with react-window
• Performance profiling completed
• PERFORMANCE.md added