Tools & Wizards About Us

Report Summary

  • 15

    Performance

    Renders faster than
    27% of other websites

  • 82

    Accessibility

    Visual factors better than
    that of 52% of websites

  • 50

    Best Practices

    More advanced features
    available than in
    19% of websites

  • 64

    SEO

    Google-friendlier than
    24% of websites

vinacert.vn

Công ty CP Chứng nhận và Giám định VinaCert | Dịch vụ Chứng nhận | Giám định | Dịch vụ Thử nghiệm

Page Load Speed

27.5 sec in total

First Response

11.6 sec

Resources Loaded

15.6 sec

Page Rendered

315 ms

About Website

Visit vinacert.vn now to see the best up-to-date Vina Cert content for Vietnam and also check out these interesting facts you probably never knew about vinacert.vn

Thử nghiệm: VinaCert là tổ chức thử nghiệm duy nhất của Việt Nam được Hiệp hội Công nhận Phòng thử nghiệm Hoa Kỳ (A2LA) - công nhận đủ năng lực theo tiêu chuẩn quốc tế ISO/IEC 17025:2017 Chứng nhận: H...

Visit vinacert.vn

Key Findings

We analyzed Vinacert.vn page load time and found that the first response time was 11.6 sec and then it took 16 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

vinacert.vn performance score

15

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value8.2 s

0/100

10%

LCP (Largest Contentful Paint)

Value20.5 s

0/100

25%

SI (Speed Index)

Value17.5 s

0/100

10%

TBT (Total Blocking Time)

Value720 ms

41/100

30%

CLS (Cumulative Layout Shift)

Value0.48

18/100

15%

TTI (Time to Interactive)

Value20.1 s

2/100

10%

Network Requests Diagram

vinacert.vn

11562 ms

analytics.js

15 ms

fbevents.js

28 ms

jquery.min.js

1446 ms

newwindow.js

743 ms

Our browser made a total of 121 requests to load all elements on the main page. We found that 77% of them (93 requests) were addressed to the original Vinacert.vn, 6% (7 requests) were made to Page.widget.zalo.me and 5% (6 requests) were made to Google.com. The less responsive or slowest element that took the longest time to load (11.6 sec) belongs to the original domain Vinacert.vn.

Page Optimization Overview & Recommendations

Page size can be reduced by 880.2 kB (28%)

Content Size

3.1 MB

After Optimization

2.2 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Vinacert.vn main page is 3.1 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. Images take 2.0 MB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 96.5 kB

  • Original 120.4 kB
  • After minification 105.7 kB
  • After compression 23.9 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 14.7 kB, which is 12% 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 96.5 kB or 80% of the original size.

Image Optimization

-23%

Potential reduce by 456.0 kB

  • Original 2.0 MB
  • After minification 1.5 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. Obviously, Vina Cert needs image optimization as it can save up to 456.0 kB or 23% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-19%

Potential reduce by 127.7 kB

  • Original 689.2 kB
  • After minification 673.3 kB
  • After compression 561.5 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 127.7 kB or 19% of the original size.

CSS Optimization

-64%

Potential reduce by 200.0 kB

  • Original 311.5 kB
  • After minification 289.8 kB
  • After compression 111.6 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. Vinacert.vn needs all CSS files to be minified and compressed as it can save up to 200.0 kB or 64% of the original size.

Requests Breakdown

Number of requests can be reduced by 41 (35%)

Requests Now

117

After Optimization

76

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 117 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Vina Cert. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 23 to 1 for JavaScripts and from 20 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

vinacert.vn accessibility score

82

Accessibility Issues

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

Links do not have a discernible name

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

vinacert.vn best practices score

50

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

vinacert.vn SEO score

64

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

Language and Encoding

  • Language Detected

    VI

  • Language Claimed

    VI

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Vinacert.vn can be misinterpreted by Google and other search engines. Our service has detected that Vietnamese is used on the page, and it matches the claimed language. Our system also found out that Vinacert.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 Vina Cert. 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: