PageSpeed Insights

Google's tool for page performance and best practice checks.

PageSpeed Insights analyses a URL for speed, accessibility and best practices, and sometimes exposes third-party scripts and resources loaded by a page. Marginal for recon but useful for mapping external dependencies.

Why it's useful

Shows what third-party assets a page pulls in.

Category: Reconnaissance & OSINT
Pricing: Free
Tags: web, performance, audit, recon
Link: pagespeed.web.dev