Report Summary

  • 50

    Performance

    Renders faster than
    69% of other websites

  • 85

    Accessibility

    Visual factors better than
    that of 60% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 69

    SEO

    Google-friendlier than
    28% of websites

nio.cn

NIO蔚来汽车官方网站

Page Load Speed

56.4 sec in total

First Response

883 ms

Resources Loaded

55.2 sec

Page Rendered

358 ms

nio.cn screenshot

About Website

Visit nio.cn now to see the best up-to-date Nio content for China and also check out these interesting facts you probably never knew about nio.cn

蔚来是一家全球化的智能电动汽车公司,于2014年11月成立。蔚来致力于通过提供高性能的智能电动汽车与极致用户体验,为用户创造愉悦的生活方式。

Visit nio.cn

Key Findings

We analyzed Nio.cn page load time and found that the first response time was 883 ms and then it took 55.6 sec to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster. Unfortunately, there was 1 request timeout, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

nio.cn performance score

50

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.7 s

59/100

10%

LCP (Largest Contentful Paint)

Value11.2 s

0/100

25%

SI (Speed Index)

Value6.4 s

40/100

10%

TBT (Total Blocking Time)

Value320 ms

76/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value10.1 s

26/100

10%

Network Requests Diagram

nio.cn

883 ms

shop36551478.taobao.com

7099 ms

shop36551478.taobao.com

2701 ms

shop36551478.world.taobao.com

2176 ms

shop36551478.world.taobao.com

13807 ms

Our browser made a total of 110 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Nio.cn, 46% (51 requests) were made to G.alicdn.com and 14% (15 requests) were made to Img.alicdn.com. The less responsive or slowest element that took the longest time to load (19.9 sec) relates to the external source Login.taobao.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 476.2 kB (25%)

Content Size

1.9 MB

After Optimization

1.4 MB

In fact, the total size of Nio.cn main page is 1.9 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. 50% of websites need less resources to load. Images take 1.1 MB which makes up the majority of the site volume.

HTML Optimization

-73%

Potential reduce by 102.4 kB

  • Original 140.9 kB
  • After minification 126.4 kB
  • After compression 38.5 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 102.4 kB or 73% of the original size.

Image Optimization

-8%

Potential reduce by 82.6 kB

  • Original 1.1 MB
  • After minification 1.0 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

-40%

Potential reduce by 214.4 kB

  • Original 534.3 kB
  • After minification 534.0 kB
  • After compression 319.9 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 214.4 kB or 40% of the original size.

CSS Optimization

-75%

Potential reduce by 76.7 kB

  • Original 102.5 kB
  • After minification 102.4 kB
  • After compression 25.8 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 needs all CSS files to be minified and compressed as it can save up to 76.7 kB or 75% of the original size.

Requests Breakdown

Number of requests can be reduced by 64 (65%)

Requests Now

99

After Optimization

35

The browser has sent 99 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 48 to 1 for JavaScripts and from 9 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

nio.cn accessibility score

85

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

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

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Image elements do not have [alt] attributes

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

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

Best Practices

nio.cn best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

nio.cn SEO score

69

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

High

robots.txt is not valid

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

Mobile Friendly

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/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    ZH

  • Language Claimed

    N/A

  • Encoding

    GBK

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 neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Nio.cn main page’s claimed encoding is gbk. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

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: