Tools & Wizards About Us
hoc24h.vn screenshot

Report Summary

  • 30

    Performance

    Renders faster than
    50% of other websites

  • 50

    Accessibility

    Visual factors better than
    that of 21% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 74

    SEO

    Google-friendlier than
    31% of websites

hoc24h.vn

Hoc24h.vn | Học, thi trực tuyến Toán học, Vật lý, Hóa học, Sinh học, Tiếng Anh ...

Page Load Speed

4.6 sec in total

First Response

21 ms

Resources Loaded

4.2 sec

Page Rendered

355 ms

hoc24h.vn screenshot

About Website

Click here to check amazing Hoc24h content for Vietnam. Otherwise, check out these important facts you probably never knew about hoc24h.vn

Trang Web học trực tuyến số một Việt Nam. Luyện thi các môn: Toán học, Vật lý, Hóa học, Sinh học, Tiếng Anh, TOEIC, IELTS, Toán cao cấp

Visit hoc24h.vn

Key Findings

We analyzed Hoc24h.vn page load time and found that the first response time was 21 ms and then it took 4.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

hoc24h.vn performance score

30

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.3 s

7/100

10%

LCP (Largest Contentful Paint)

Value15.9 s

0/100

25%

SI (Speed Index)

Value19.0 s

0/100

10%

TBT (Total Blocking Time)

Value460 ms

61/100

30%

CLS (Cumulative Layout Shift)

Value0.162

72/100

15%

TTI (Time to Interactive)

Value17.1 s

4/100

10%

Network Requests Diagram

hoc24h.vn

21 ms

hoc24h.vn

2114 ms

jquery-3.2.1.min.js

50 ms

bootstrap.min.js

62 ms

bootstrap.css

75 ms

Our browser made a total of 163 requests to load all elements on the main page. We found that 15% of them (24 requests) were addressed to the original Hoc24h.vn, 42% (68 requests) were made to Fonts.gstatic.com and 34% (55 requests) were made to Stc.hoc24h.vn. The less responsive or slowest element that took the longest time to load (2.6 sec) belongs to the original domain Hoc24h.vn.

Page Optimization Overview & Recommendations

Page size can be reduced by 772.8 kB (11%)

Content Size

7.3 MB

After Optimization

6.5 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Hoc24h.vn main page is 7.3 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. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 6.8 MB which makes up the majority of the site volume.

HTML Optimization

-86%

Potential reduce by 89.2 kB

  • Original 103.4 kB
  • After minification 67.7 kB
  • After compression 14.2 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 35.7 kB, which is 35% 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 89.2 kB or 86% of the original size.

Image Optimization

-10%

Potential reduce by 670.4 kB

  • Original 6.8 MB
  • After minification 6.1 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. Hoc24h images are well optimized though.

JavaScript Optimization

-2%

Potential reduce by 4.6 kB

  • Original 238.9 kB
  • After minification 238.8 kB
  • After compression 234.3 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. This website has mostly compressed JavaScripts.

CSS Optimization

-7%

Potential reduce by 8.6 kB

  • Original 131.6 kB
  • After minification 131.6 kB
  • After compression 122.9 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. Hoc24h.vn has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 44 (49%)

Requests Now

90

After Optimization

46

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 90 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Hoc24h. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 19 to 1 for JavaScripts and from 27 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

hoc24h.vn

hoc24h.vn

21 ms

hoc24h.vn

hoc24h.vn

2114 ms

jquery-3.2.1.min.js

jquery-3.2.1.min.js

50 ms

bootstrap.min.js

bootstrap.min.js

62 ms

bootstrap.css

bootstrap.css

75 ms

master.css

master.css

83 ms

theme.css

theme.css

79 ms

blog.css

blog.css

86 ms

va.css

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Accessibility Review

hoc24h.vn accessibility score

50

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 input fields do not have accessible names

High

Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.

High

ARIA IDs are not unique

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

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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.

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

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

hoc24h.vn best practices score

58

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Requests the notification permission on page load

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

hoc24h.vn SEO score

74

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

    VI

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Hoc24h.vn can be misinterpreted by Google and other search engines. Our service has detected that Vietnamese 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 Hoc24h.vn 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

hoc24h.vn

Open Graph data is detected on the main page of Hoc24h. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: