description ARC Toolkit Overview
ARC Toolkit is a free, open-source web performance testing tool that analyzes website speed and identifies specific bottlenecks like large images, slow server responses, or render-blocking resources, providing detailed diagnostic data for optimization.
help ARC Toolkit FAQ
What does ARC Toolkit check on a website?
ARC Toolkit analyzes web pages for performance problems such as large images, slow server responses, and render-blocking resources. It provides diagnostic details that developers can use to target specific fixes.
Is ARC Toolkit a browser extension or a command-line tool?
ARC Toolkit is presented as a free, open-source web testing tool that can inspect pages in a browser-based workflow. It is intended for interactive diagnosis rather than only server-side load generation.
How is ARC Toolkit different from Lighthouse?
Both can help identify page problems, but ARC Toolkit emphasizes detailed web-performance bottlenecks while Lighthouse combines performance with accessibility, SEO, and best-practice audits. Running both can give a broader view of a page's technical health.
Can ARC Toolkit identify render-blocking resources?
Yes, render-blocking resources are among the specific issues the toolkit is designed to flag. These can delay the first visible content because the browser must process them before continuing to render the page.
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