π΄ Critical β Fix before launch Β· π‘ Important β Fix if possible Β· π’ Optional β Nice to have
Slow websites lose users before they read a single word. Google also uses Core Web Vitals as a ranking signal. Every millisecond of improvement raises both rankings and conversion rates. This section covers every performance layer from loading to interactivity to infrastructure.
π‘ Why this group matters: Google measures these 3 signals to determine how good your page experience is. They directly affect both your SEO ranking and how many users stick around.
LCP measures how long it takes for the biggest visible element on screen β hero image, headline, product screenshot β to fully appear. It's when users feel the page has actually loaded.
π― Benchmarks: β Under 2.5s β Good Β· β οΈ 2.5β4s β Needs work Β· β Over 4s β Poor
fetchpriority="high" attribute set so browser downloads it firstfont-display: swap to avoid blocking renderπ Diagnose: PageSpeed Insights β scroll to "LCP element" β it shows exactly what's slow and why