More performance tools
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?
HTTP requests checkerHow many files a page loads, by type.
Lazy loading images checkerAre images below the top lazy-loaded?
JavaScript defer checkerFind render-blocking scripts.
Inline CSS checkerCount <style> blocks and style attributes.
Image format checkerWhich images could move to WebP or AVIF.
How to use the dom size checker
Count DOM elements, depth and the widest node. 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.