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Performance Optimization

Learn how to optimize Bellamy Book for better performance.

Frontend Optimization​

Code Splitting​

Use React lazy loading:

import { lazy, Suspense } from 'react';

const PostFeed = lazy(() => import('./components/PostFeed'));

function App() {
  return (
    <Suspense fallback={<div>Loading...</div>}>
      <PostFeed />
    </Suspense>
  );
}

Image Optimization​

Optimize images before upload:

function optimizeImage(file) {
  return new Promise((resolve) => {
    const reader = new FileReader();
    reader.onload = (e) => {
      const img = new Image();
      img.onload = () => {
        const canvas = document.createElement('canvas');
        const ctx = canvas.getContext('2d');
        canvas.width = 1200;
        canvas.height = (img.height * 1200) / img.width;
        ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
        canvas.toBlob(resolve, 'image/jpeg', 0.8);
      };
      img.src = e.target.result;
    };
    reader.readAsDataURL(file);
  });
}

Caching​

Implement service worker caching:

// service-worker.js
self.addEventListener('fetch', (event) => {
  if (event.request.url.includes('/api/Post')) {
    event.respondWith(
      caches.open('posts-cache').then((cache) => {
        return fetch(event.request).then((response) => {
          cache.put(event.request, response.clone());
          return response;
        });
      })
    );
  }
});

Backend Optimization​

Database Indexing​

Ensure proper indexes:

CREATE INDEX idx_posts_author_created ON posts(author_id, created_at DESC);
CREATE INDEX idx_comments_post_created ON comments(post_id, created_at DESC);
CREATE INDEX idx_reactions_target ON reactions(target_id, target_type);

Caching Strategy​

Use Redis for caching:

// Cache frequently accessed data
var cacheKey = $"user:{userId}";
var cachedUser = await _cache.GetAsync<User>(cacheKey);

if (cachedUser == null)
{
    cachedUser = await _userRepository.GetByIdAsync(userId);
    await _cache.SetAsync(cacheKey, cachedUser, TimeSpan.FromMinutes(30));
}

Query Optimization​

Use efficient queries:

// Good: Eager loading
var posts = await _context.Posts
    .Include(p => p.Author)
    .Include(p => p.Reactions)
    .Where(p => p.AuthorId == userId)
    .ToListAsync();

// Avoid: N+1 queries
var posts = await _context.Posts.ToListAsync();
foreach (var post in posts)
{
    post.Author = await _context.Users.FindAsync(post.AuthorId); // Bad!
}

API Optimization​

Pagination​

Always use pagination:

GET /api/Post/feed/home?userId=...&limit=20&offset=0

Field Selection​

Request only needed fields:

GET /api/Post/{postId} (or feed with limit)

Compression​

Enable response compression:

services.AddResponseCompression(options =>
{
    options.EnableForHttps = true;
    options.Providers.Add<GzipCompressionProvider>();
});

Monitoring​

Performance Metrics​

Track key metrics:

  • API response times
  • Database query times
  • Cache hit rates
  • Error rates

Tools​

Use monitoring tools:

  • Application Insights
  • New Relic
  • Custom logging

Best Practices​

  1. Lazy Load: Load content as needed
  2. Cache Aggressively: Cache frequently accessed data
  3. Optimize Images: Compress and resize images
  4. Database Indexes: Add indexes for common queries
  5. Monitor Performance: Track and optimize slow queries

Next Steps​