Report Summary

  • 33

    Performance

    Renders faster than
    53% of other websites

  • 58

    Accessibility

    Visual factors better than
    that of 25% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 69

    SEO

    Google-friendlier than
    28% of websites

51zbz.net

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Page Load Speed

30.1 sec in total

First Response

6.3 sec

Resources Loaded

23.5 sec

Page Rendered

360 ms

51zbz.net screenshot

About Website

Click here to check amazing 51 Zbz content for China. Otherwise, check out these important facts you probably never knew about 51zbz.net

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Key Findings

We analyzed 51zbz.net page load time and found that the first response time was 6.3 sec and then it took 23.8 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.

Performance Metrics

51zbz.net performance score

33

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.5 s

65/100

10%

LCP (Largest Contentful Paint)

Value4.6 s

35/100

25%

SI (Speed Index)

Value9.0 s

15/100

10%

TBT (Total Blocking Time)

Value4,160 ms

1/100

30%

CLS (Cumulative Layout Shift)

Value0.032

100/100

15%

TTI (Time to Interactive)

Value14.3 s

9/100

10%

Network Requests Diagram

51zbz.net

6318 ms

style.css

5823 ms

cnw.js

1197 ms

f.js

971 ms

c.js

1005 ms

Our browser made a total of 47 requests to load all elements on the main page. We found that 19% of them (9 requests) were addressed to the original 51zbz.net, 19% (9 requests) were made to Pos.baidu.com and 17% (8 requests) were made to Cpro.baidustatic.com. The less responsive or slowest element that took the longest time to load (8.7 sec) relates to the external source Pos.baidu.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 375.4 kB (69%)

Content Size

542.9 kB

After Optimization

167.5 kB

In fact, the total size of 51zbz.net main page is 542.9 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 30% of websites need less resources to load. Javascripts take 411.8 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 49.6 kB

  • Original 63.5 kB
  • After minification 62.8 kB
  • After compression 13.9 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 49.6 kB or 78% of the original size.

Image Optimization

-37%

Potential reduce by 19.7 kB

  • Original 53.3 kB
  • After minification 33.6 kB

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. Obviously, 51 Zbz needs image optimization as it can save up to 19.7 kB or 37% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-72%

Potential reduce by 295.0 kB

  • Original 411.8 kB
  • After minification 411.8 kB
  • After compression 116.8 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 295.0 kB or 72% of the original size.

CSS Optimization

-78%

Potential reduce by 11.2 kB

  • Original 14.4 kB
  • After minification 11.4 kB
  • After compression 3.2 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. 51zbz.net needs all CSS files to be minified and compressed as it can save up to 11.2 kB or 78% of the original size.

Requests Breakdown

Number of requests can be reduced by 28 (64%)

Requests Now

44

After Optimization

16

The browser has sent 44 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 51 Zbz. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 16 to 1 for JavaScripts and as a result speed up the page load time.

Accessibility Review

51zbz.net accessibility score

58

Accessibility Issues

ARIA

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.

Impact

Issue

High

[aria-*] attributes do not match their roles

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.

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Form elements do not have associated labels

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

Best Practices

51zbz.net best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

SEO Factors

51zbz.net SEO score

69

Search Engine Optimization Advices

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

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 51zbz.net 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 51zbz.net 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

Open Graph description is not detected on the main page of 51 Zbz. 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: