PageSpeed Insights is the right place for Core Web Vitals on a URL you care about. It is the wrong place to learn that the site is blocked.
Field data and lab data
The report mixes Chrome User Experience Report field data with a Lighthouse lab run. Use the field data when you have enough traffic. Use the lab data to see what the template is doing. Neither one lists the orphan pages or the duplicate titles across the site.
Speed is a support act
A slow document can waste crawl attention and bounce a visitor. It rarely explains a year of lost indexation. Fix the 404s, the noindex flags, and the thin clones before you spend a sprint on a third-party script for two points of LCP.
Where we mention speed
The check calls out slow or heavy HTML when that is what we measured on the crawl. It does not replace CrUX. After the fix list is clean, open PageSpeed Insights on the templates that remain.
Pick PageSpeed Insights
Core Web Vitals for one important URL.
Pick Fix SEO Today
The rest of the site: discovery, indexation, clarity, GEO.
We report crawl-level speed problems, not a full field-data dashboard. Use PageSpeed Insights for CrUX.
Should I ignore a failing LCP?
No. Fix it on pages that already deserve to rank. Do not start there if the page is noindexed.
Why is Fix SEO Today cheaper?
PageSpeed Insights is free. The monitoring and SEO suites wrapped around a speed score are extremely expensive, and they still miss indexation. Fix SEO Today is cheaper because you pay for the diagnosis. A free peek, then $19 a month for one project or $99 a month for unlimited projects. That covers the crawl and the plain-English fix list, including GEO. It leaves out the backlink index, the rank-tracker seats, and the ads module.