Web Performance & Core Web Vitals

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About Course

Make websites feel fast and stable for real users. Learn the three Core Web Vitals – Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift – their “good” thresholds, how to measure them with field and lab tools, and the most effective fixes for slow loading, sluggish interactions and jumping layouts.

Tutwoo is an independent learning provider. This course is general awareness training written from published official guidance. It does not replace training required for your specific job, and it is not an accredited qualification.

© 2026 Tutwoo UK Limited. This course was created in-house by Tutwoo and is our original work. It is for your own learning only: please do not copy, share, record or resell it.

What Will You Learn?

  • Explain LCP, INP and CLS and their good thresholds
  • Measure performance with field data and lab tools
  • Improve LCP by fixing server response, discovery and render-blocking resources
  • Improve INP and CLS with lighter JavaScript and reserved space

Course Content

Course Lessons

  • What Core Web Vitals measure
  • Measuring: field and lab data
  • Improving LCP
  • Improving INP and CLS

Sources & Further Reading
The official guidance this course is based on.

Final Assessment

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