Web Performance Metrics: Core Web Vitals, Page Weight & Caching
LCP, INP and CLS at the 75th percentile, good/needs-improvement/poor shares, page weight budgets, 3G/4G transfer times, CDN hit ratio, compression savings and the link to conversion: 8 labs on one fictional online shop.
The first lesson is free — no account needed.
About this course
A web performance metrics course that measures one fictional online shop in a spreadsheet, for web developers, SEO specialists, product managers and e-commerce analysts. You compute the 75th percentile of LCP, INP and CLS from real-user page views and rate each as Good, Needs improvement or Poor, turn the views into band shares by device with COUNTIFS, total the page weight by resource type against a budget, estimate load times on 3G and 4G from bytes, bandwidth and round trips, calculate the correctly weighted CDN cache hit ratio and origin offload, measure Brotli versus gzip and image format savings, link load time to conversion with CORREL and buckets and build a performance budget dashboard with red flags. The thresholds follow the published Core Web Vitals guidance. Tabellab is not affiliated with Google. The first lab is free.
Lessons
- Core Web Vitals at the 75th Percentile: LCP, INP & CLSFree
- Good, Needs Improvement, Poor: Share of Visits with COUNTIFS Pro
- Page Weight Budget by Resource Type Pro
- Transfer Time on 3G & 4G: Bytes, Bandwidth & Round Trips Pro
- CDN Cache Hit Ratio & Origin Offload Pro
- Compression & Image Savings: gzip, Brotli & Modern Formats Pro
- Performance vs Conversion: CORREL & Bucketed Conversion Rates Pro
- Performance Budget Dashboard: Budgets Met & Red Flags Pro