Access nio.cn.

name

value

score

weighting

FCP (First Contentful Paint)

Value4.7 s

13/100

10%

LCP (Largest Contentful Paint)

Value46.4 s

0/100

25%

SI (Speed Index)

Value18.2 s

0/100

10%

TBT (Total Blocking Time)

Value670 ms

44/100

30%

CLS (Cumulative Layout Shift)

Value0.566

12/100

15%

TTI (Time to Interactive)

Value17.7 s

4/100

10%

www.nio.cn

867 ms

sensorsdata.min.js

43 ms

hm.js

1307 ms

push.js

1150 ms

fcagl.js

1920 ms

Our browser made a total of 117 requests to load all elements on the main page. We found that 60% of them (70 requests) were addressed to the original Nio.cn, 29% (34 requests) were made to Cdn-public.nio.com and 3% (4 requests) were made to Nio.com. The less responsive or slowest element that took the longest time to load (3.3 sec) relates to the external source Cdn-public.nio.com.

Content Size

13.5 MB

After Optimization

13.0 MB

In fact, the total size of Nio.cn main page is 13.5 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 70% of websites need less resources to load. Images take 12.5 MB which makes up the majority of the site volume.

HTML Optimization

-86%

Potential reduce by 135.2 kB

Original 158.0 kB
After minification 157.6 kB
After compression 22.8 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 135.2 kB or 86% of the original size.

Image Optimization

-3%

Potential reduce by 334.8 kB

Original 12.5 MB
After minification 12.1 MB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Nio images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 467 B

Original 771.0 kB
After minification 771.0 kB
After compression 770.5 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. This website has mostly compressed JavaScripts.

CSS Optimization

-0%

Potential reduce by 134 B

Original 77.8 kB
After minification 77.8 kB
After compression 77.7 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Nio.cn has all CSS files already compressed.

Requests Now

112

After Optimization

The browser has sent 112 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Nio. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 32 to 1 for JavaScripts and from 8 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

High

[aria-hidden="true"] elements contain focusable descendents

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

These are opportunities to improve keyboard navigation in your application.

High

[id] attributes on active, focusable elements are not unique

These items highlight common accessibility best practices.

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Areas of Improvement

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

Search Engine Optimization Advices

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

Language Detected

ZH
Language Claimed

ZH
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Nio.cn can be misinterpreted by Google and other search engines. Our service has detected that Chinese is used on the page, and it matches the claimed language. Our system also found out that Nio.cn main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

nio.cn

Open Graph description is not detected on the main page of Nio. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks:

Report Summary

Performance

Accessibility

Best Practices

SEO

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

www.nio.cn

sensorsdata.min.js

hm.js

push.js

fcagl.js

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

www.nio.cn

sensorsdata.min.js

hm.js

push.js

fcagl.js

hotjar-3582105.js

c0cca55edf74fb06.css

a73850a796d3c9da.css

13dbcf765789a68b.css

e42eba74566118ad.css

73262fefc4744580.css

05c8e2491aecd40f.css

1270ea15b740828f.css

594279304ebff414.css

polyfills-c67a75d1b6f99dc8.js

webpack-b6ca73914b3c0013.js

framework-4ed89e9640adfb9e.js

main-9ac2de808c1d19a9.js

_app-26b48ac350258685.js

6c38dde5-c5a5f27f8633505f.js

be05fd52-f6ab607b439162eb.js

2257-7ed8574bd5fe4cdd.js

2328-d89ab2a6790e3cd7.js

5174-4f54b4a0028ac4bd.js

3253-ebed7986902d1cb2.js

6066-d4470ddee1711f01.js

1056-8b1cb0cebe7e5961.js

7268-d3a19782b6e5cade.js

1644-aad17ec786d53e21.js

1167-78cbe5a2b9a8ca57.js

5230-4e5d4a4798d1af50.js

7255-918319e5a4b4fa9a.js

7272-3a948735e4293b6b.js

4491-c334829f74a4fa68.js

6396-81431777f0a946bb.js

3352-389102b23b1f4fbc.js

7354-a31525c4b9c0bc77.js

index-71f4dd8017e91173.js

_buildManifest.js

_ssgManifest.js

nio-logo-white.svg

ET5T.svg

icon_language.svg

icon_signin.svg