Penthouse
Generates critical CSS for web pages to speed up initial rendering by extracting above-the-fold styles.
What is Penthouse?
Penthouse is a Node.js tool that generates critical path CSS for web pages by analyzing full CSS files and page content to extract only the styles needed for above-the-fold rendering. It solves the problem of render-blocking CSS by automating the creation of optimized critical CSS, which speeds up initial page load times. The tool uses Puppeteer and headless Chrome to accurately simulate page rendering and produce ready-to-use CSS.
Frontend developers and performance engineers working on web optimization projects, particularly those focused on improving Core Web Vitals and reducing time-to-first-paint.
Developers choose Penthouse because it’s the original critical CSS generator with robust automation, Puppeteer integration for accuracy, and production-ready output. It supports batch processing and fine-tuning options, making it reliable for both single pages and large-scale sites.
Overview
Generate critical css for your web pages
Use Cases
Best For
- Optimizing Core Web Vitals like Largest Contentful Paint (LCP)
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