Tools & Wizards About Us
yb21.cn screenshot

Report Summary

  • 72

    Performance

    Renders faster than
    82% of other websites

  • 65

    Accessibility

    Visual factors better than
    that of 31% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    81% of websites

  • 85

    SEO

    Google-friendlier than
    56% of websites

yb21.cn

全国邮政编码查询系统

Page Load Speed

12.5 sec in total

First Response

2.1 sec

Resources Loaded

9.5 sec

Page Rendered

890 ms

yb21.cn screenshot

About Website

Welcome to yb21.cn homepage info - get ready to check Yb 21 best content for China right away, or after learning these important things about yb21.cn

全国邮政编码查询系统,全国邮编查询,提供全国各大城市,乡镇的邮政编码查询,精确到乡镇,全国一百多万个乡镇邮政编码,数据全面并且精确。全国IP地址查询,本机IP查询,手机号码查询,IP138查询

Visit yb21.cn

Key Findings

We analyzed Yb21.cn page load time and found that the first response time was 2.1 sec and then it took 10.4 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.

Performance Metrics

yb21.cn performance score

72

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.6 s

32/100

10%

LCP (Largest Contentful Paint)

Value3.6 s

61/100

25%

SI (Speed Index)

Value6.6 s

38/100

10%

TBT (Total Blocking Time)

Value210 ms

89/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value4.7 s

80/100

10%

Network Requests Diagram

yb21.cn

2133 ms

style.css

729 ms

bus03.gif

494 ms

bus06.gif

498 ms

bus09.gif

567 ms

Our browser made a total of 12 requests to load all elements on the main page. We found that 58% of them (7 requests) were addressed to the original Yb21.cn, 8% (1 request) were made to S11.cnzz.com and 8% (1 request) were made to Oz.cnzz.com. The less responsive or slowest element that took the longest time to load (2.5 sec) relates to the external source C.cnzz.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 34.6 kB (79%)

Content Size

44.0 kB

After Optimization

9.3 kB

  • HTML
  • JavaScript
  • CSS

In fact, the total size of Yb21.cn main page is 44.0 kB. This result falls within a vast category (top 1 000 000) of heavyweight, probably not optimized, and thus slow loading web pages. Only a small number of websites need less resources to load. HTML takes 30.3 kB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 25.7 kB

  • Original 30.3 kB
  • After minification 30.2 kB
  • After compression 4.6 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 25.7 kB or 85% of the original size.

JavaScript Optimization

-64%

Potential reduce by 6.9 kB

  • Original 10.7 kB
  • After minification 10.7 kB
  • After compression 3.8 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 6.9 kB or 64% of the original size.

CSS Optimization

-70%

Potential reduce by 2.1 kB

  • Original 3.0 kB
  • After minification 2.4 kB
  • After compression 883 B

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. Yb21.cn needs all CSS files to be minified and compressed as it can save up to 2.1 kB or 70% of the original size.

Requests Breakdown

Number of requests can be reduced by 6 (60%)

Requests Now

10

After Optimization

4

  • Images
  • JavaScript
  • CSS

The browser has sent 10 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Yb 21. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests and as a result speed up the page load time.

Network Requests Diagram

yb21.cn

yb21.cn

2133 ms

style.css

style.css

729 ms

bus03.gif

bus03.gif

494 ms

bus06.gif

bus06.gif

498 ms

bus09.gif

bus09.gif

567 ms

bus07.gif

bus07.gif

247 ms

bus04.gif

bus04.gif

250 ms

z_stat.php

z_stat.php

2002 ms

stat.htm

stat.htm

255 ms

core.php

core.php

2477 ms

9.gif

9.gif

1497 ms

app.gif

app.gif

1377 ms

Accessibility Review

yb21.cn accessibility score

65

Accessibility Issues

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

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

yb21.cn best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

yb21.cn SEO score

85

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

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

    GB2312

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Yb21.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 Yb21.cn main page’s claimed encoding is gb2312. 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

yb21.cn

Open Graph description is not detected on the main page of Yb 21. 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: