LCP is usually the hardest to optimize because it captures the page's slowest-loading above-fold element — hero images, hero video, custom fonts. Optimization wins typically come from preloading critical resources, deferring third-party scripts, and serving correctly-sized images.
CLS is usually the easiest to fix and the most-violated. The fix is consistent: declare width + height on every image and embed, reserve space for ads + dynamic content before they load, and avoid inserting content above existing content after page load.
For landing page conversion specifically, CWV affects bounce more than ranking. A page that takes 6 seconds to render loses most of its traffic before they see the hero, regardless of how well the page is written. Performance is a precondition for conversion.
How Lytms scores it
Lytms scores the Post-click dimension with performance signals included (perf-blocker module, axe-blocker module). Pages with poor Core Web Vitals score lower on Post-click and the related findings name the specific blocker.
See also
See core web vitals on your own page.
One URL. About 2 minutes.