People often use the terms “website speed” and “Core Web Vitals” as if they mean the same thing, but they are related rather than identical.
Website speed tests
A speed test usually gives you lab data. That means the page is tested in a controlled environment. Tools like Lighthouse and PageSpeed Insights show metrics such as LCP, CLS, and other diagnostic information.
Core Web Vitals
Core Web Vitals focus on the real user experience, especially loading, visual stability, and responsiveness.
Why both matter
Lab tests help you identify likely technical issues. Core Web Vitals help you understand how real users experience your site in the field.
Practical use
Use speed tests to prioritize fixes and use Core Web Vitals to confirm whether those fixes improve the user experience over time.