Core Web Vitals matter because Google explicitly uses them as ranking factors, and poor scores directly correlate with higher bounce rates and lost revenue. The three metrics—Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS)—measure loading speed, interactivity, and visual stability. Sites that fail these thresholds rank below competitors who pass, all else equal. LCP measures how long your main content takes to render. If it exceeds 2.5 seconds, users often abandon the page before seeing what they came for. INP replaced First Input Delay in 2024 and tracks how quickly your site responds to clicks, taps, and keystrokes—anything over 200ms feels sluggish. CLS penalizes layouts that shift unexpectedly when images or ads load, causing misclicks and frustration. Google sets these benchmarks because user behavior data shows people leave sites that feel slow or unstable. The ranking impact is real but not catastrophic. Core Web Vitals act as a tiebreaker between similarly relevant pages. If your content and backlinks are stronger, you can still outrank a faster competitor, but you're giving away free points. More importantly, the user experience penalties compound: a one-second delay in mobile load time can drop conversions by 20%, and e-commerce sites see direct revenue loss from layout shifts that cause accidental cart abandonments. At Ottawa SEO, we prioritize the metrics that align with actual user pain points. We see the biggest wins from optimizing LCP—lazy-loading images, minimizing render-blocking resources, using CDNs for Canadian traffic. INP improvements usually come from reducing JavaScript execution time and deferring non-critical scripts. CLS fixes are often trivial: setting explicit width and height attributes on images and reserving space for ad slots. You don't need perfect scores across every page. Focus on your money pages—product pages, service landing pages, high-traffic blog posts. Use Google Search Console's Core Web Vitals report to identify which URLs fail, then prioritize by traffic and conversion value. Passing thresholds on your top 20% of pages delivers most of the ranking and revenue benefit.