Sample speed report

Prepared demonstration data for example.com. This is not an audit of your website or a customer case study. No sign-in or card required; no usage limits are consumed.

The website needs speed optimization.

Page URLhttps://example.com

Region: Amsterdam · nl-ams
Date and time: February 10, 2025 at 02:23 PM UTC
Device: Mobile
Network speed: —

Technologies

ReactNext.jsjQueryTailwind CSSWebpack

Additional measurement settings

User agentMozilla/5.0 (Linux; Android 11; moto g power (2022)) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Mobile Safari/537.36

Lighthouse12.4.0

Screen resolution360×640

Network speed1.4 Mbps · RTT 150ms

Key speed metrics

First Contentful Paint (FCP)

1.8s

≤1.8s

Largest Contentful Paint (LCP)

3.2s

≤2.5s

Cumulative Layout Shift (CLS)

0.05

≤0.10

Time to First Byte

600ms

≤0.8s

Total Blocking Time

450ms

≤200ms

Speed Index

2.8s

≤3.4s

INP is available as a separate service The INP service runs real clicks and input scenarios, looking for long-animation-frames and heavy handlers. Open

What to fix first

In this example, vendor.js and app.js contain unused JavaScript. Find them in the resource usage chart, defer unnecessary code, then repeat the measurement with the same device and region. Compare transfer size and main-thread blocking time.

CLS analysis

no data

Long tasks

up to 120ms120–300msover 300ms

Resource sizes

1.8 MB

JS12 resources

963 KB

Image18 resources

600 KB

CSS4 resources

150 KB

fonts3 resources

120 KB

Document1 resource

25 KB

Usage chart

/assets/vendor.js200 KB500 KB60%

/assets/app.js100 KB250 KB60%

/assets/analytics.js56 KB80 KB30%

Network diagnostics

17 requests

Show duplicatesShowing 17 of 17


/	200	580 ms	Very high
/assets/styles.css	200	120 ms	Very high
/assets/components.css	200	95 ms	Very high
/assets/vendor.js	200	340 ms	High
/assets/app.js	200	220 ms	High
/assets/analytics.js	200	110 ms	Low
https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap	200	85 ms	Very high
https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu4mxK.woff2	200	65 ms	High
https://fonts.gstatic.com/s/roboto/v30/KFOlCnqEu92Fr1MmWUlfBBc4.woff2	200	70 ms	High
/images/hero.webp	200	250 ms	High
/images/banner.webp	200	280 ms	Low
/images/footer-bg.png	200	190 ms	Low
/images/icon-check.svg	200	25 ms	Low
/api/v1/config	200	145 ms	High
https://www.google-analytics.com/analytics.js	200	95 ms	Low

Resource loading hints

Resource hints
Rel	As	Resource
Rel preconnect	As —	Resource https://fonts.googleapis.com
Rel preconnect	As —	Resource https://fonts.gstatic.com
Rel dns-prefetch	As —	Resource https://www.google-analytics.com
Rel preload	As image	Resource /images/hero.webp
Rel preload	As font	Resource https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu4mxK.woff2

Resource loading priorities

Resource fetch priorities
Resource	Priority	Size	Recommendation
Resource /images/hero.webp	Priority high	Size —	Recommendation —
Resource /assets/analytics.js	Priority low	Size —	Recommendation —
Resource https://www.google-analytics.com/analytics.js	Priority low	Size —	Recommendation —
Resource /images/footer-bg.png	Priority low	Size —	Recommendation —

Third-party resources

Third-party resources and their impact on speed
3rd-party	Requests	Size	Impact on speed
Third party fonts.gstatic.com	Requests 2	Size 81 KB	Impact on speed low
Third party www.google-analytics.com	Requests 1	Size 17 KB	Impact on speed low
Third party fonts.googleapis.com	Requests 1	Size 1 KB	Impact on speed low

Additional metrics

Navigation timings

DOMContentLoaded: 2.5 s
DOMComplete: 4.8 s
LoadEvent: 4.9 s

DOM and documents

Documents: 1
Frames: 1
DOM nodes: 850

JavaScript memory

JS event listeners: 85
Total JS heap size: 15.0 MB
Used JS heap size: 10.0 MB