Font Performance Hub
Comprehensive guides for optimizing font loading performance. Master Core Web Vitals, implement efficient caching, use resource hints effectively, and deliver fonts that enhance rather than hinder your site speed.
Why Font Performance Matters
Fonts are often the largest render-blocking resources on web pages. A single unoptimized web font can add 500ms-2s to your page load time, directly impacting Core Web Vitals scores, SEO rankings, and user experience. Proper font optimization can improve LCP by 30-50% and eliminate layout shifts caused by font loading.
Font Loading Metrics
Understand how fonts impact Core Web Vitals including LCP, FCP, and CLS. Learn to measure and optimize font performance.
Font Render Blocking
Master the critical rendering path for fonts. Prevent render-blocking and optimize font delivery for faster first paint.
Font Caching Strategies
Implement browser caching best practices for fonts. Configure Cache-Control headers, immutable caching, and CDN strategies.
Preload & Preconnect
Use resource hints to prioritize font loading. Master preload, preconnect, and prefetch for optimal font delivery.
Font Display Swap
Complete guide to the font-display CSS property. Choose between swap, fallback, optional, and block for your use case.
Font Size Calculator
Interactive tool to calculate font file size impact on your site. Estimate load times and get optimization recommendations.
Subsetting Strategies
Learn when and how to subset fonts for maximum performance. Compare full fonts vs subsets for different use cases.
Variable Fonts Performance
Compare variable font performance vs multiple static font files. Learn when variable fonts improve or hurt performance.
@font-face Optimization
Write optimal @font-face declarations for performance. Master format order, local() fallbacks, and descriptor optimization.
Quick Performance Reference
Core Web Vitals Targets
- • LCP: < 2.5 seconds (Good)
- • FCP: < 1.8 seconds (Good)
- • CLS: < 0.1 (Good)
- • Font budget: 100-200KB total
Optimization Priorities
- • Use WOFF2 format (30% smaller)
- • Preload critical fonts
- • Use font-display: swap
- • Subset to needed characters
Caching Best Practices
- • Cache-Control: max-age=31536000
- • Use immutable directive
- • Version fonts in filename
- • CDN with edge caching
Performance Tools
Font Size Calculator
Calculate the performance impact of your font files. Get load time estimates and optimization recommendations based on your font sizes.
Try the calculator →Font Subsetter Tool
Remove unused characters from your fonts to reduce file sizes by up to 90%. Essential for performance optimization.
Subset your fonts →Optimize Your Font Performance
Start with our font size calculator to understand your current performance, then use our optimization tools to improve load times.