Ensuring top-notch user experience is paramount. One powerful tool that comes bundled with Create React App is the web-vitals library. This third-party library captures and measures user experience metrics to help you deliver smooth, responsive, and user-friendly web applications.
๐What Are Web Vitals?
Web Vitals are crucial metrics for evaluating the quality of the user experience on the web. They are divided into two categories:
๐ Core Web Vitals
-
Cumulative Layout Shift (CLS):
- ๐ Definition: Measures the visual stability of a web page by tracking unexpected layout shifts.
- ๐ Importance: Ensures elements don't move unexpectedly, providing a stable layout as the content loads.
- ๐ Recommended Score:
- โ Good: โค 0.1
- โ ๏ธ Needs Improvement: > 0.1 and โค 0.25
- โ Poor: > 0.25
-
First Input Delay (FID):
- ๐ Definition: Measures the time from a user's first interaction to when the browser can begin processing that interaction.
- ๐ Importance: Reflects the page's responsiveness and interactivity, crucial for user experience.
- ๐ Recommended Score:
- โ Good: โค 100 ms
- โ ๏ธ Needs Improvement: > 100 ms and โค 300 ms
- โ Poor: > 300 ms
-
Largest Contentful Paint (LCP):
- ๐ผ๏ธ Definition: Measures the loading performance by tracking the render time of the largest visible content element.
- ๐ Importance: Ensures users can quickly see and interact with the main content.
- ๐ Recommended Score:
- โ Good: โค 2.5 seconds
- โ ๏ธ Needs Improvement: > 2.5 seconds and โค 4.0 seconds
- โ Poor: > 4.0 seconds
๐ Other Web Vitals
-
First Contentful Paint (FCP):
- ๐ Definition: Measures the time for the first piece of DOM content to be rendered.
- ๐ Importance: Provides visual feedback that the page is loading, reducing perceived loading time.
- ๐ Recommended Score:
- โ Good: โค 1.8 seconds
- โ ๏ธ Needs Improvement: > 1.8 seconds and โค 3.0 seconds
- โ Poor: > 3.0 seconds
-
Time to First Byte (TTFB):
- ๐ Definition: Measures the time for the browser to receive the first byte of page content from the server.
- ๐ Importance: Reflects server responsiveness and efficiency, impacting initial load time.
- ๐ Recommended Score:
- โ Good: โค 800 ms
- โ ๏ธ Needs Improvement: > 800 ms and โค 1.5 seconds
- โ Poor: > 1.5 seconds
Lastly, don't neglect performance! ๐๐ป
WebDevelopment #JavaScript #CreateReactApp #WebVitals #UserExperience #FrontendDevelopment
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