Performance Budget Calculator

# Performance Budget Report

**Target Device:** Mobile
**Network Condition:** 3G Fast
**Budget Type:** Comprehensive

## 🎯 Core Web Vitals

These metrics directly impact search rankings and user experience:

### Largest Contentful Paint (LCP)
- **Good:** ≤ 2.5seconds
- **Needs Improvement:** 2.51-4seconds
- **Poor:** > 4seconds
- **Description:** Time to render the largest visible content element

### First Input Delay (FID)
- **Good:** ≤ 100milliseconds
- **Needs Improvement:** 100.01-300milliseconds
- **Poor:** > 300milliseconds
- **Description:** Time from user interaction to browser response

### Cumulative Layout Shift (CLS)
- **Good:** ≤ 0.1score
- **Needs Improvement:** 0.11-0.25score
- **Poor:** > 0.25score
- **Description:** Visual stability - unexpected layout shifts

## ⚡ Performance Metrics

### First Contentful Paint (FCP)
- **Good:** ≤ 1.8seconds
- **Needs Improvement:** 1.81-3seconds
- **Poor:** > 3seconds
- **Priority:** HIGH
- **Description:** Time to first visible content render
- **Measurement:** Lighthouse, WebPageTest, browser dev tools

### Time to First Byte (TTFB)
- **Good:** ≤ 800milliseconds
- **Needs Improvement:** 800.01-1800milliseconds
- **Poor:** > 1800milliseconds
- **Priority:** HIGH
- **Description:** Server response time for initial request
- **Measurement:** Browser dev tools, WebPageTest, synthetic monitoring

### Total Blocking Time (TBT)
- **Good:** ≤ 200milliseconds
- **Needs Improvement:** 200.01-600milliseconds
- **Poor:** > 600milliseconds
- **Priority:** HIGH
- **Description:** Total time main thread was blocked
- **Measurement:** Lighthouse performance audit

### Speed Index
- **Good:** ≤ 3.4score
- **Needs Improvement:** 3.4099999999999997-5.8score
- **Poor:** > 5.8score
- **Priority:** MEDIUM
- **Description:** Visual progress of page loading
- **Measurement:** Lighthouse, WebPageTest visual progress

## 📦 Resource Budgets

### Total Page Weight
- **Good:** ≤ 1600KB
- **Needs Improvement:** 1601-3000KB
- **Poor:** > 3000KB
- **Priority:** HIGH
- **Description:** Total size of all page resources

### JavaScript Bundle Size
- **Good:** ≤ 350KB
- **Needs Improvement:** 351-750KB
- **Poor:** > 750KB
- **Priority:** CRITICAL
- **Description:** Total JavaScript downloaded and parsed

### CSS Size
- **Good:** ≤ 75KB
- **Needs Improvement:** 76-150KB
- **Poor:** > 150KB
- **Priority:** MEDIUM
- **Description:** Total CSS downloaded

### Images Size
- **Good:** ≤ 800KB
- **Needs Improvement:** 801-1500KB
- **Poor:** > 1500KB
- **Priority:** HIGH
- **Description:** Total image payload

### Web Fonts Size
- **Good:** ≤ 100KB
- **Needs Improvement:** 101-200KB
- **Poor:** > 200KB
- **Priority:** MEDIUM
- **Description:** Total web font payload

### HTTP Requests
- **Good:** ≤ 50count
- **Needs Improvement:** 51-100count
- **Poor:** > 100count
- **Priority:** MEDIUM
- **Description:** Total number of HTTP requests

## 🚀 React Optimization Tips

- Use React.lazy() and Suspense for code splitting
- Implement useMemo and useCallback for expensive computations
- Use React.memo for component memoization
- Consider Next.js for automatic optimizations
- Implement proper key props to avoid unnecessary re-renders
- Use React DevTools Profiler to identify performance bottlenecks

## 🛠️ Optimization Strategies

- 📦 Bundle Optimization: Use tree shaking, code splitting, and dynamic imports
- 🖼️ Image Optimization: WebP format, responsive images, lazy loading
- ⚡ Critical Path: Inline critical CSS, preload key resources
- 🗄️ Caching: Implement service workers, CDN, and browser caching
- 🔄 Compression: Enable Gzip/Brotli, minify assets
- 📱 Progressive Loading: Skeleton screens, progressive enhancement
- 🎯 Third-party: Audit and optimize external scripts
- 🔍 Monitoring: Implement RUM and synthetic monitoring

## 💡 Implementation Recommendations

### Monitoring Setup
1. **Real User Monitoring (RUM):** Implement tools like Google Analytics, New Relic, or DataDog
2. **Synthetic Monitoring:** Use Lighthouse CI, WebPageTest, or Pingdom
3. **Core Web Vitals Tracking:** Monitor CWV in Google Search Console

### Budget Implementation
1. **CI/CD Integration:** Fail builds that exceed performance budgets
2. **Bundle Analysis:** Use webpack-bundle-analyzer or similar tools
3. **Regular Audits:** Schedule weekly/monthly performance reviews

### Priority Matrix
- **Critical:** Core Web Vitals, JavaScript bundle size
- **High:** TTFB, FCP, total page weight, images
- **Medium:** CSS size, Speed Index, fonts, HTTP requests
- **Low:** Non-critical third-party resources