More performance tools
Image dimensions checkerImages without width and height that make the page jump (CLS).
Page cache checkerBrowser and CDN caching headers of a page (Cache-Control, ETag, Age, CDN cache s...
Page speed checkerPage speed score, load timings, page weight and what slows the page down.
TTFB checkerTime to first byte, DNS, connect and TLS timings.
Page size checkerHow big is the page's HTML?
DOM size checkerCount DOM elements, depth and the widest node.
HTTP requests checkerHow many files a page loads, by type.
Lazy loading images checkerAre images below the top lazy-loaded?
How to use the javascript defer checker
Find render-blocking scripts. Enter the page address above and press the button. Results appear on this page and you can share the link.
Visitors can run 30 checks a day. Create a free account for projects, site audits, rank tracking and saved keyword lists.