TL;DR Core Web Vitals
Core Web Vitals are a set of real world performance metrics defined by Google that measure how a page actually feels to use, not just how fast it technically loads. The three metrics are Largest Contentful Paint which measures loading performance, Interaction to Next Paint which measures responsiveness, and Cumulative Layout Shift which measures visual stability. Google uses Core Web Vitals as a ranking signal as part of its page experience evaluation, meaning poor scores can directly affect where your site appears in search results. The good news is that most Core Web Vitals improvements come from infrastructure choices rather than code changes. Fast servers, Brotli compression, a properly configured CDN, and a low TTFB all contribute positively to your scores, which is exactly what CloudSonic's stack is tuned to deliver.
How Core Web Vitals Work
Core Web Vitals are measured by Google using real world data collected from Chrome users through the Chrome User Experience Report, known as CrUX. This means your scores are based on how actual visitors experience your site rather than synthetic lab tests, though lab tools like Google PageSpeed Insights and Lighthouse can give you a useful proxy. The three metrics each measure a different dimension of page experience. Largest Contentful Paint measures how long it takes for the largest visible element on the page, usually a hero image or heading, to finish rendering. Interaction to Next Paint measures the delay between a user interaction like a click and the browser's next visual response. Cumulative Layout Shift measures how much the page layout moves around unexpectedly while loading, which causes visitors to accidentally click the wrong thing.
Google collects this data over a 28 day rolling window and classifies each metric as Good, Needs Improvement, or Poor based on defined thresholds. A URL needs to pass all three metrics at the Good threshold for at least 75 percent of its measured visits to be considered passing Core Web Vitals overall. These scores feed into Google's page experience ranking signal alongside HTTPS, mobile friendliness, and absence of intrusive interstitials. Improving your TTFB through better hosting infrastructure is one of the highest leverage actions you can take because it improves LCP directly.
╭────────────────────────────────────────────────────╮
│ Local API Alerts │
├────────────────────────────────────────────┬───────┤
│ Reason │ Count │
├────────────────────────────────────────────┼───────┤
│ crowdsecurity/http-bad-user-agent │ 45 │
│ crowdsecurity/http-cve-2021-41773 │ 30 │
│ crowdsecurity/http-probing │ 29 │
│ crowdsecurity/CVE-2017-9841 │ 19 │
│ crowdsecurity/http-cve-2021-42013 │ 19 │
│ crowdsecurity/http-admin-interface-probing │ 10 │
│ crowdsecurity/http-open-proxy │ 10 │
│ crowdsecurity/nginx-req-limit-exceeded │ 6 │
│ crowdsecurity/http-sensitive-files │ 6 │
│ crowdsecurity/ssh-time-based-bf │ 5 │
│ crowdsecurity/ssh-bf │ 5 │
│ crowdsecurity/http-technology-probing │ 7 │
│ crowdsecurity/http-wordpress-scan │ 3 │
│ crowdsecurity/CVE-2022-41082 │ 2 │
│ crowdsecurity/ssh-time-based-bf_user-enum │ 2 │
│ crowdsecurity/http-crawl-non_statics │ 2 │
│ crowdsecurity/CVE-2019-18935 │ 1 │
│ crowdsecurity/ssh-slow-bf │ 4 │
╰────────────────────────────────────────────┴───────╯
Why Core Web Vitals Matter for Your Website
Core Web Vitals matter for two distinct reasons that compound each other. The first is ranking. Google uses Core Web Vitals as a ranking signal as part of its page experience evaluation. Pages that fail Core Web Vitals are at a disadvantage in search results compared to pages that pass, all else being equal. The second reason is conversion. The metrics Core Web Vitals measure, how fast the page visually loads, how quickly it responds to interaction, and how stable the layout is, are directly correlated with user behaviour. Slow LCP means visitors see a blank or partially loaded page for longer and are more likely to leave before it finishes loading. Poor CLS means buttons and links jump around as the page loads and visitors accidentally click the wrong thing. Poor INP means the page feels unresponsive to interaction. Every one of these outcomes reduces engagement, increases bounce rate, and costs conversions. Fixing Core Web Vitals improves both your search visibility and your business results simultaneously.
