Tools & Wizards About Us

Report Summary

  • 48

    Performance

    Renders faster than
    66% of other websites

  • 87

    Accessibility

    Visual factors better than
    that of 66% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 85

    SEO

    Google-friendlier than
    55% of websites

download.vn

Download.vn Tài liệu về đề thi, giáo án, giáo án điện tử, bài tập cuối tuần, bài tập theo đề chuyên đầy đủ các lớp, các môn học

Page Load Speed

8.3 sec in total

First Response

21 ms

Resources Loaded

7.7 sec

Page Rendered

551 ms

About Website

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

Download.vn - Tài liệu về đề thi, giáo án, giáo án điện tử, bài tập cuối tuần, bài tập theo chuyên đề, mầm non, thi chuyển cấp đầy đủ các lớp, các môn

Visit download.vn

Key Findings

We analyzed Download.vn page load time and found that the first response time was 21 ms and then it took 8.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.

Performance Metrics

download.vn performance score

48

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.3 s

98/100

10%

LCP (Largest Contentful Paint)

Value2.4 s

92/100

25%

SI (Speed Index)

Value10.1 s

9/100

10%

TBT (Total Blocking Time)

Value5,790 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.075

95/100

15%

TTI (Time to Interactive)

Value26.1 s

0/100

10%

Network Requests Diagram

download.vn

21 ms

download.vn

1818 ms

player.js

176 ms

gtm.js

60 ms

holder.png

39 ms

Our browser made a total of 205 requests to load all elements on the main page. We found that 9% of them (19 requests) were addressed to the original Download.vn, 63% (129 requests) were made to O.rada.vn and 10% (20 requests) were made to Googleads.g.doubleclick.net. The less responsive or slowest element that took the longest time to load (2.7 sec) relates to the external source O.rada.vn.

Page Optimization Overview & Recommendations

Page size can be reduced by 328.7 kB (21%)

Content Size

1.5 MB

After Optimization

1.2 MB

  • HTML
  • Images
  • JavaScript

In fact, the total size of Download.vn main page is 1.5 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. 70% of websites need less resources to load. Javascripts take 740.7 kB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 252.2 kB

  • Original 302.8 kB
  • After minification 274.8 kB
  • After compression 50.5 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 252.2 kB or 83% of the original size.

Image Optimization

-6%

Potential reduce by 31.8 kB

  • Original 502.6 kB
  • After minification 470.9 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. Download images are well optimized though.

JavaScript Optimization

-6%

Potential reduce by 44.7 kB

  • Original 740.7 kB
  • After minification 740.5 kB
  • After compression 695.9 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.

Requests Breakdown

Number of requests can be reduced by 87 (46%)

Requests Now

190

After Optimization

103

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 190 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Download. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 26 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

download.vn accessibility score

87

Accessibility Issues

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

[id] attributes on active, focusable elements are not unique

High

Heading elements are not in a sequentially-descending order

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

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

download.vn best practices score

58

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

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

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

download.vn 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

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 Download.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 Download.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

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