adilallo
392 lines
8.7 KiB
Markdown
392 lines
8.7 KiB
Markdown
# Performance Optimization Guide
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## 📋 Table of Contents
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- [Overview](#overview)
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- [Performance Targets](#performance-targets)
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- [Frontend Optimizations](#frontend-optimizations)
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- [Performance Monitoring](#performance-monitoring)
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- [Bundle Analysis](#bundle-analysis)
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- [Web Vitals Tracking](#web-vitals-tracking)
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- [Performance Testing](#performance-testing)
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- [Troubleshooting](#troubleshooting)
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- [Best Practices](#best-practices)
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## 🎯 Overview
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This guide covers the comprehensive performance optimization strategy implemented in Community Rule 3.0 to achieve sub-2-second load times across all platform features.
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### Performance Philosophy
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- **Measure First**: Comprehensive monitoring before optimization
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- **Performance Budgets**: Enforce limits to prevent regression
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- **Real User Monitoring**: Track actual user experience
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- **Continuous Optimization**: Regular monitoring and improvement
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## 🎯 Performance Targets
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### Core Web Vitals
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- **LCP (Largest Contentful Paint)**: < 2.5s (Good)
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- **FID (First Input Delay)**: < 100ms (Good)
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- **CLS (Cumulative Layout Shift)**: < 0.1 (Good)
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- **FCP (First Contentful Paint)**: < 1.8s (Good)
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- **TTFB (Time to First Byte)**: < 800ms (Good)
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### Bundle Size Targets
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- **Initial JavaScript Bundle**: < 250KB gzipped (currently 101KB)
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- **Total Bundle Size**: < 2MB
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- **Individual Component Bundles**: < 50KB
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- **Image Assets**: Optimized with WebP/AVIF formats
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### Lighthouse Scores
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- **Performance**: > 90
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- **Accessibility**: > 90
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- **Best Practices**: > 90
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- **SEO**: > 90
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## ⚡ Frontend Optimizations
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### 1. Code Splitting
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Dynamic imports for non-critical components to reduce initial bundle size:
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```javascript
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// Dynamic imports for non-critical components
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const NumberedCards = dynamic(() => import("./components/NumberedCards"), {
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loading: () => <div className="loading-placeholder">Loading...</div>,
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});
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const LogoWall = dynamic(() => import("./components/LogoWall"), {
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loading: () => <div className="loading-placeholder">Loading...</div>,
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});
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```
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### 2. React.memo Optimization
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Applied to all 30+ components to prevent unnecessary re-renders:
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```javascript
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import React, { memo } from "react";
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const MyComponent = memo(({ prop1, prop2 }) => {
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return <div>{/* Component content */}</div>;
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});
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MyComponent.displayName = "MyComponent";
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export default MyComponent;
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```
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### 3. useMemo and useCallback
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Optimized expensive computations and event handlers:
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```javascript
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import React, { memo, useMemo, useCallback } from "react";
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const OptimizedComponent = memo(({ data, onAction }) => {
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// Memoize expensive computations
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const processedData = useMemo(() => {
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return data.map((item) => expensiveOperation(item));
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}, [data]);
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// Memoize event handlers
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const handleClick = useCallback(
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(id) => {
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onAction(id);
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},
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[onAction],
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);
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return <div onClick={handleClick}>{/* Component content */}</div>;
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});
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```
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### 4. Image Optimization
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Enhanced `next/image` with lazy loading and blur placeholders:
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```javascript
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import Image from "next/image";
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<Image
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src="/assets/image.jpg"
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alt="Description"
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width={300}
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height={200}
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sizes="(max-width: 768px) 100vw, 50vw"
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loading="lazy"
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placeholder="blur"
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blurDataURL="data:image/jpeg;base64,..."
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/>;
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```
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### 5. Font Optimization
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Preloading and fallbacks for all fonts:
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```javascript
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import { Inter, Bricolage_Grotesque, Space_Grotesk } from "next/font/google";
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const inter = Inter({
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subsets: ["latin"],
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preload: true,
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fallback: ["system-ui", "arial"],
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});
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const bricolageGrotesque = Bricolage_Grotesque({
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subsets: ["latin"],
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preload: true,
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fallback: ["system-ui", "arial"],
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});
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```
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### 6. Error Boundaries
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Comprehensive error handling to prevent cascade failures:
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```javascript
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import React, { Component } from "react";
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class ErrorBoundary extends Component {
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constructor(props) {
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super(props);
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this.state = { hasError: false, error: null };
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}
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static getDerivedStateFromError(error) {
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return { hasError: true };
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}
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componentDidCatch(error, errorInfo) {
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console.error("ErrorBoundary caught an error:", error, errorInfo);
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}
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render() {
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if (this.state.hasError) {
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return <div>Something went wrong.</div>;
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}
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return this.props.children;
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}
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}
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```
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## 📊 Performance Monitoring
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### Available Scripts
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```bash
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# Individual monitoring tools
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npm run bundle:analyze # Analyze bundle sizes and budgets
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npm run performance:monitor # Performance metrics and Lighthouse CI
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npm run web-vitals:track # Core Web Vitals tracking
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# Comprehensive testing
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npm run test:performance # All performance tests
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npm run monitor:all # All monitoring tools
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```
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### Performance Dashboard
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Access the performance monitoring dashboard at `/monitor` to view:
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- Real-time Web Vitals metrics
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- Historical performance data
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- Bundle analysis results
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- Performance budget status
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- Optimization recommendations
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## 📦 Bundle Analysis
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### Bundle Analyzer Script
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The bundle analyzer provides comprehensive analysis of bundle sizes:
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```bash
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npm run bundle:analyze
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```
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**Features:**
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- Analyzes static assets, chunks, and pages
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- Checks against performance budgets
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- Generates optimization recommendations
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- Saves results in JSON and Markdown formats
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**Output Files:**
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- `.next/analyze/bundle-analysis.json` - Detailed analysis data
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- `.next/analyze/bundle-report.md` - Human-readable report
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### Performance Budgets
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Defined in `performance-budgets.json`:
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```json
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{
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"budgets": [
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{
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"name": "lcp",
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"maxValue": 2500,
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"description": "Largest Contentful Paint"
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},
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{
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"name": "bundle-size",
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"maxSizeKB": 250,
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"description": "Initial JavaScript bundle size"
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}
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]
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}
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```
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## 📈 Web Vitals Tracking
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### Real-time Monitoring
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The Web Vitals tracking system collects and reports Core Web Vitals:
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```bash
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npm run web-vitals:track
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```
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**Features:**
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- Collects LCP, FID, CLS, FCP, TTFB metrics
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- Stores historical data (last 100 entries per metric)
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- Generates summary reports
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- Provides optimization recommendations
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**API Endpoint:**
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- `POST /api/web-vitals` - Receives Web Vitals data
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- `GET /api/web-vitals` - Returns aggregated metrics
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### Web Vitals Dashboard
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The dashboard component displays real-time and historical metrics:
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```javascript
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import WebVitalsDashboard from "./components/WebVitalsDashboard";
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<WebVitalsDashboard />;
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```
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## 🧪 Performance Testing
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### Comprehensive Testing
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Run all performance tests with a single command:
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```bash
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npm run test:performance
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```
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**Test Coverage:**
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- Bundle analysis with budget checking
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- Performance monitoring with Lighthouse CI
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- Web Vitals tracking setup
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- Comprehensive reporting
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### Individual Tests
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```bash
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# Bundle analysis only
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npm run bundle:analyze
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# Performance monitoring only
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npm run performance:monitor
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# Web Vitals tracking only
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npm run web-vitals:track
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# All monitoring tools
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npm run monitor:all
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```
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## 🔧 Troubleshooting
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### Common Issues
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#### 1. Bundle Size Exceeds Budget
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```bash
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# Check bundle analysis
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npm run bundle:analyze
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# Review recommendations in .next/analyze/bundle-report.md
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# Consider code splitting or removing unused dependencies
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```
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#### 2. Web Vitals Poor Performance
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```bash
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# Check Web Vitals data
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npm run web-vitals:track
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# Review dashboard at /monitor
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# Optimize images, fonts, or JavaScript
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```
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#### 3. Performance Tests Failing
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```bash
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# Run comprehensive performance test
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npm run test:performance
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# Check individual components
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npm run bundle:analyze
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npm run performance:monitor
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```
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### Debug Commands
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```bash
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# Debug bundle analysis
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npm run bundle:analyze --verbose
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# Debug performance monitoring
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npm run performance:monitor --debug
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# Check Web Vitals data
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curl http://localhost:3000/api/web-vitals
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```
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## 🎯 Best Practices
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### Development
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1. **Always use React.memo** for components that receive props
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2. **Implement useMemo/useCallback** for expensive operations
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3. **Use dynamic imports** for non-critical components
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4. **Optimize images** with proper sizing and formats
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5. **Preload critical fonts** and resources
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### Monitoring
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1. **Run bundle analysis** before major releases
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2. **Monitor Web Vitals** in production
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3. **Check performance budgets** in CI/CD
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4. **Review optimization recommendations** regularly
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### Performance Budgets
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1. **Set realistic budgets** based on user needs
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2. **Monitor budget violations** in CI/CD
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3. **Optimize when budgets are exceeded**
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4. **Update budgets** as requirements change
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## 📚 Additional Resources
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- **Next.js Performance**: https://nextjs.org/docs/advanced-features/measuring-performance
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- **Web Vitals**: https://web.dev/vitals/
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- **Lighthouse CI**: https://github.com/GoogleChrome/lighthouse-ci
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- **React Performance**: https://react.dev/learn/render-and-commit
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---
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**Last Updated**: December 2024
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**Maintained by**: CommunityRule Development Team
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