react.dev

react.dev based on real-user data from Chrome UX Report

All

Mobile

Desktop

In-Depth

Latest

Web Vitals

Time to First ByteExp
Time to First Byte (TTFB)Experimental is the time it takes to receive the first byte from the server. A fast TTFB indicates that the server responses quickly.Learn more at web.dev/ttfb/→
i

0.4s

Good <= 0.8s

86.7%

Need Impr.

9.2%

Poor > 1.8s

4.1%

First Contentful Paint
First Contentful Paint (FCP) marks the time when the user can see anything on the screen. A fast FCP helps reassure the user that something is happening.Learn more at web.dev/fcp/→
i

1.2s

Good <= 1.8s

86.9%

Need Impr.

7%

Poor > 3.0s

6.2%

Largest Contentful PaintCWV
Largest Contentful Paint (LCP)Core Web Vital marks the time when the page's main content has likely loaded. A fast LCP helps reassure the user that the page is useful.Learn more at web.dev/lcp/→
i

1.1s

Good <= 2.5s

92.8%

Need Impr.

3.6%

Poor > 4.0s

3.6%

Interaction to Next PaintCWV
Interaction to Next Paint (INP)Core Web Vital measures interaction latency. It observes the latency of all interactions a user has made with the page, and reports a single value which all (or nearly all) interactions were below. A low INP means the page was consistently able to respond quickly to user interactions.Learn more at web.dev/inp/→
i

50ms

Good <= 200ms

91.7%

Need Impr.

4.6%

Poor > 500ms

3.7%

Cumulative Layout ShiftCWV
Cumulative Layout Shift (CLS)Core Web Vital quantifies how often users experience unexpected layout shifts. A fast CLS indicates that the page is delightful.Learn more at web.dev/cls/→
i

0

Good <= 0.1

96.1%

Need Impr.

2.9%

Poor > 0.25

1%

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Geography

Form Factors

Mobile

12%

Desktop

88%

Popularity Rank

Top 100,000

Navigations

i

Navigate

76.2%

i

Cache

10.5%

i

Back-Forward

0.5%

i

Bfcache

46.5% / 0.5%

i

Reload

5.3%

i

Restore

6.1%

i

Prerender

0.9%

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react.dev

Site speed audit for https://react.dev based on real-user data from Chrome UX Report

Web Vitals

Time to First ByteExpTime to First Byte (TTFB)Experimental is the time it takes to receive the first byte from the server. A fast TTFB indicates that the server responses quickly.Learn more at web.dev/ttfb/→i

First Contentful PaintFirst Contentful Paint (FCP) marks the time when the user can see anything on the screen. A fast FCP helps reassure the user that something is happening.Learn more at web.dev/fcp/→i

Largest Contentful PaintCWVLargest Contentful Paint (LCP)Core Web Vital marks the time when the page's main content has likely loaded. A fast LCP helps reassure the user that the page is useful.Learn more at web.dev/lcp/→i

Cumulative Layout ShiftCWVCumulative Layout Shift (CLS)Core Web Vital quantifies how often users experience unexpected layout shifts. A fast CLS indicates that the page is delightful.Learn more at web.dev/cls/→i

Unlock 10x site speed insights with a Treo account:

Geography

Form Factors

Popularity Rank

Navigations

If you want to optimize your site's speed, give Treo a try

Time to First ByteExp
Time to First Byte (TTFB)Experimental is the time it takes to receive the first byte from the server. A fast TTFB indicates that the server responses quickly.Learn more at web.dev/ttfb/→
i

First Contentful Paint
First Contentful Paint (FCP) marks the time when the user can see anything on the screen. A fast FCP helps reassure the user that something is happening.Learn more at web.dev/fcp/→
i

Largest Contentful PaintCWV
Largest Contentful Paint (LCP)Core Web Vital marks the time when the page's main content has likely loaded. A fast LCP helps reassure the user that the page is useful.Learn more at web.dev/lcp/→
i

Cumulative Layout ShiftCWV
Cumulative Layout Shift (CLS)Core Web Vital quantifies how often users experience unexpected layout shifts. A fast CLS indicates that the page is delightful.Learn more at web.dev/cls/→
i