Ways to go deeper with this site:
It encodes the HTML or text retained in each crawl record and reports that captured size in kilobytes. Depending on the crawler record, this may not equal the original response body or transferred bytes.
No. Total transferred page weight can include the document, images, CSS, JavaScript, fonts, media, and third-party responses. This checker does not download and total those resources.
No. The 500 KB band is a review threshold used by this analyzer, not a Core Web Vitals threshold or proof of poor performance. Compare templates, inspect the actual response and DOM, and measure user-facing performance before changing a page.
Yes. An initial guest scan is available without signing up. A free account includes 5 scans per month; Pro and Agency plans include unlimited scans. Crawl coverage and completion time vary.
No. It reports captured HTML or text size and the number of image records. It does not provide a byte breakdown for images, scripts, styles, fonts, video, or third-party requests. Use a browser network trace for that evidence.
First confirm the live HTML response size and whether the crawl stored raw HTML or extracted text. Then inspect repeated markup, embedded data, inline assets, templates, hydration payloads, and the rendered DOM. Test any change against real transfer size and user performance.
Crawl Timing
Compare crawl response-completion times across public pages
Lighthouse Test
Run one desktop Lighthouse performance analysis through Google PageSpeed Insights
Image Optimization
Review image alt attributes, URL extensions, inline data, and page counts
Mobile UX
Review crawl-captured text, markup cues, image records, links, headings, and fetch timing for mobile follow-up