Access xuetong.com. 【学通在线】 xuetong.com—职业技能培训和认证一站式平台 - 学通在线：职业技能培训和认证一站式平台

name

value

score

weighting

FCP (First Contentful Paint)

Value4.1 s

21/100

10%

LCP (Largest Contentful Paint)

Value6.4 s

10/100

25%

SI (Speed Index)

Value9.3 s

12/100

10%

TBT (Total Blocking Time)

Value330 ms

75/100

30%

CLS (Cumulative Layout Shift)

Value0.33

34/100

15%

TTI (Time to Interactive)

Value10.7 s

22/100

10%

xuetong.com

9583 ms

bootstrap.css

20487 ms

common.css

2810 ms

font-awesome.min.css

2410 ms

es-icon.css

1202 ms

Our browser made a total of 57 requests to load all elements on the main page. We found that 74% of them (42 requests) were addressed to the original Xuetong.com, 5% (3 requests) were made to Combo.b.qq.com and 5% (3 requests) were made to Hb.crm2.qq.com. The less responsive or slowest element that took the longest time to load (20.5 sec) belongs to the original domain Xuetong.com.

Content Size

1.3 MB

After Optimization

619.4 kB

In fact, the total size of Xuetong.com main page is 1.3 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. 20% of websites need less resources to load. CSS take 528.5 kB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 46.7 kB

Original 60.6 kB
After minification 49.9 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. This page needs HTML code to be minified as it can gain 10.7 kB, which is 18% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 46.7 kB or 77% of the original size.

Image Optimization

-9%

Potential reduce by 38.1 kB

Original 441.9 kB
After minification 403.8 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. Xuetong images are well optimized though.

JavaScript Optimization

-55%

Potential reduce by 156.6 kB

Original 286.2 kB
After minification 276.1 kB
After compression 129.6 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 156.6 kB or 55% of the original size.

CSS Optimization

-86%

Potential reduce by 456.4 kB

Original 528.5 kB
After minification 431.6 kB
After compression 72.1 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. Xuetong.com needs all CSS files to be minified and compressed as it can save up to 456.4 kB or 86% of the original size.

Requests Now

After Optimization

The browser has sent 49 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Xuetong. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 29 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 semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

High

Buttons do not have an accessible name

High

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

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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 interpretation of your content by users in different locales.

High

<html> element does not have a valid value for its [lang] attribute.

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

Serves images with low resolution

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

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

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Xuetong.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 Xuetong.com 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

xuetong.com

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

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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

xuetong.com

bootstrap.css

common.css

font-awesome.min.css

es-icon.css

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

xuetong.com

bootstrap.css

common.css

font-awesome.min.css

es-icon.css

main.css

graceful-blue.css

10560669d8e7779328.png

130043be08af426834.jpg

block_picture_1436435383.jpg

block_picture_1436513184.jpg

lazyload_course.png

lazyload_class.png

163627b83070992553.jpg

163501520ad3345929.jpg

1635335dfc54471673.jpg

largeavatar0592af66.jpg

wpa.php

sea.js

seajs-style.js

seajs-global-config.js

bar_qq.png

webchat.jpg

h.js

Panel.js

localStorage.js

iconfont.woff

fontawesome-webfont.woff

es-icon.woff

contains.js

r.cgi

ta.php

crmqq.php

wpa_first_heart_beat.php

21.gif

hm.gif

app.js

jquery.js

bootstrap.js

bootstrap-modal-hack2.js

placeholder.js

card.js

index.js