Access shanghai.zxxk.com. 学科网-海量中小学教育资源共享平台、权威教学资源门户网站！

name

value

score

weighting

FCP (First Contentful Paint)

Value7.9 s

0/100

10%

LCP (Largest Contentful Paint)

Value18.5 s

0/100

25%

SI (Speed Index)

Value13.1 s

2/100

10%

TBT (Total Blocking Time)

Value440 ms

64/100

30%

CLS (Cumulative Layout Shift)

Value2.177

0/100

15%

TTI (Time to Interactive)

Value18.9 s

3/100

10%

shanghai.zxxk.com

16428 ms

Default.css

2136 ms

Class.css

1424 ms

lightwindow.css

3182 ms

prototype.js

19413 ms

Our browser made a total of 99 requests to load all elements on the main page. We found that 47% of them (47 requests) were addressed to the original Shanghai.zxxk.com, 27% (27 requests) were made to Img1.zxxk.com and 11% (11 requests) were made to Jiangsu.zxxk.com. The less responsive or slowest element that took the longest time to load (20 sec) relates to the external source Img1.zxxk.com.

Content Size

889.6 kB

After Optimization

535.7 kB

In fact, the total size of Shanghai.zxxk.com main page is 889.6 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. 25% of websites need less resources to load. Images take 529.8 kB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 67.6 kB

Original 83.4 kB
After minification 80.0 kB
After compression 15.7 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 67.6 kB or 81% of the original size.

Image Optimization

-14%

Potential reduce by 73.1 kB

Original 529.8 kB
After minification 456.7 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, Shanghai Zxxk needs image optimization as it can save up to 73.1 kB or 14% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-76%

Potential reduce by 181.0 kB

Original 238.4 kB
After minification 189.9 kB
After compression 57.4 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 181.0 kB or 76% of the original size.

CSS Optimization

-84%

Potential reduce by 32.0 kB

Original 38.0 kB
After minification 30.4 kB
After compression 5.9 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. Shanghai.zxxk.com needs all CSS files to be minified and compressed as it can save up to 32.0 kB or 84% of the original size.

Requests Now

After Optimization

The browser has sent 93 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Shanghai Zxxk. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 18 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

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

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

High

Displays images with incorrect aspect ratio

Low

Detected JavaScript libraries

High

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

Search Engine Optimization Advices

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

High

Links are not crawlable

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

High

Image elements do not have [alt] attributes

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

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 Shanghai.zxxk.com 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 Shanghai.zxxk.com 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

shanghai.zxxk.com

Open Graph description is not detected on the main page of Shanghai Zxxk. 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

学科网-海量中小学教育资源共享平台、权威教学资源门户网站！

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

shanghai.zxxk.com

Default.css

Class.css

lightwindow.css

prototype.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

shanghai.zxxk.com

Default.css

Class.css

lightwindow.css

prototype.js

effects.js

lightwindow.js

Ajax.js

dropdowncontent.js

ShowLogin.aspx

AreaName.js

top_l.js

top_r.js

search.js

Js_153.js

header.css

Js_152.js

Js_154_P.js

Js_154_T.js

bottom.js

page.js

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