Static asset optimization checker

What is checked

One page's HTML (not the whole site) for: script and stylesheet tags that block rendering, <img> tags missing explicit width/height (a common layout-shift cause), missing loading="lazy" on likely below-the-fold images, JPEG/PNG references that could use a modern format, duplicate asset references, missing cache-busting query strings, missing preload/preconnect hints, and @font-face rules missing font-display.

Bounded to one page, and heuristic where it must be

This inspects the exact page you give it, not a site-wide crawl. "Looks unminified" findings are based on a simple line-length heuristic and are reported as a heuristic, never a certainty.