Tools & Wizards About Us
zim.vn screenshot

Report Summary

  • 17

    Performance

    Renders faster than
    32% of other websites

  • 82

    Accessibility

    Visual factors better than
    that of 52% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

zim.vn

Anh Ngữ ZIM - Học Tiếng Anh cá nhân hoá & luyện thi chứng chỉ

Page Load Speed

7.5 sec in total

First Response

525 ms

Resources Loaded

5.2 sec

Page Rendered

1.7 sec

zim.vn screenshot

About Website

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

Luyện thi IELTS, TOEIC, PTE, VSTEP và Tiếng Anh Giao Tiếp cam kết đầu ra với phương pháp học tập cá nhân hoá, rút ngắn 80% thời gian tự học và đạt điểm số mục tiêu.

Visit zim.vn

Key Findings

We analyzed Zim.vn page load time and found that the first response time was 525 ms and then it took 7 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.

Performance Metrics

zim.vn performance score

17

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.9 s

10/100

10%

LCP (Largest Contentful Paint)

Value7.2 s

5/100

25%

SI (Speed Index)

Value19.5 s

0/100

10%

TBT (Total Blocking Time)

Value7,250 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.005

100/100

15%

TTI (Time to Interactive)

Value27.9 s

0/100

10%

Network Requests Diagram

zim.vn

525 ms

zim.vn

1909 ms

tex-mml-chtml.js

43 ms

gtm.js

80 ms

af5bc2a68f845782.css

1360 ms

Our browser made a total of 49 requests to load all elements on the main page. We found that 82% of them (40 requests) were addressed to the original Zim.vn, 14% (7 requests) were made to Fonts.gstatic.com and 2% (1 request) were made to Cdn.jsdelivr.net. The less responsive or slowest element that took the longest time to load (2.9 sec) belongs to the original domain Zim.vn.

Page Optimization Overview & Recommendations

Page size can be reduced by 808.3 kB (46%)

Content Size

1.8 MB

After Optimization

964.3 kB

  • HTML
  • Images

In fact, the total size of Zim.vn main page is 1.8 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. 50% of websites need less resources to load. HTML takes 946.8 kB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 800.0 kB

  • Original 946.8 kB
  • After minification 945.8 kB
  • After compression 146.8 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 800.0 kB or 84% of the original size.

Image Optimization

-1%

Potential reduce by 8.2 kB

  • Original 825.7 kB
  • After minification 817.5 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. ZIM images are well optimized though.

Requests Breakdown

Number of requests can be reduced by 37 (93%)

Requests Now

40

After Optimization

3

  • Images
  • JavaScript
  • CSS

The browser has sent 40 CSS, Javascripts, AJAX and image requests in order to completely render the main page of ZIM. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 35 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

zim.vn

zim.vn

525 ms

zim.vn

zim.vn

1909 ms

tex-mml-chtml.js

tex-mml-chtml.js

43 ms

gtm.js

gtm.js

80 ms

af5bc2a68f845782.css

af5bc2a68f845782.css

1360 ms

834617c99ef5a981.css

834617c99ef5a981.css

736 ms

5634778c896a2b30.css

5634778c896a2b30.css

743 ms

0d9bd7906d7fb6f8.css

0d9bd7906d7fb6f8.css

765 ms

polyfills-c67a75d1b6f99dc8.js

polyfills-c67a75d1b6f99dc8.js

1101 ms

25010.21ada66a5ac90c47.js

25010.21ada66a5ac90c47.js

995 ms

25285-b0551bf9b475ef0a.js

25285-b0551bf9b475ef0a.js

979 ms

75291.8c7a73cde5709410.js

75291.8c7a73cde5709410.js

1244 ms

99186-81eb9a78236addb7.js

99186-81eb9a78236addb7.js

1019 ms

83663.b4a63188b3b755f6.js

83663.b4a63188b3b755f6.js

1252 ms

23189.67fcb741e56142ce.js

23189.67fcb741e56142ce.js

1254 ms

10413.25465689ae3e7af3.js

10413.25465689ae3e7af3.js

1327 ms

37722.e64ab87578d44dfb.js

37722.e64ab87578d44dfb.js

1545 ms

webpack-b65140cca2c67ef0.js

webpack-b65140cca2c67ef0.js

1552 ms

framework-5d88fd93c6bb60e3.js

framework-5d88fd93c6bb60e3.js

1827 ms

main-bd7b32f190afbea7.js

main-bd7b32f190afbea7.js

1556 ms

_app-28e2664fb6fd49a3.js

_app-28e2664fb6fd49a3.js

2642 ms

d7eeaac4-e1eff27d040f147a.js

d7eeaac4-e1eff27d040f147a.js

1688 ms

0c428ae2-4d2a4d87d366fe65.js

0c428ae2-4d2a4d87d366fe65.js

1689 ms

252f366e-ffc678dbbf56f5d0.js

252f366e-ffc678dbbf56f5d0.js

1807 ms

545f34e4-e6e87ece5f97f67a.js

545f34e4-e6e87ece5f97f67a.js

1809 ms

ae51ba48-a3bee679c44662e0.js

ae51ba48-a3bee679c44662e0.js

1934 ms

87536-53224744353dda9d.js

87536-53224744353dda9d.js

1977 ms

7258-297a1818234a02fa.js

7258-297a1818234a02fa.js

2109 ms

48929-816720eb53ee85f9.js

48929-816720eb53ee85f9.js

2094 ms

66465-7e078da65157f259.js

66465-7e078da65157f259.js

2101 ms

9907-7482e300206c7738.js

9907-7482e300206c7738.js

2223 ms

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22004-d3425f1071a55192.js

2264 ms

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81314-9819cdd9c47fb21a.js

2360 ms

74768-096e28d599e360b0.js

74768-096e28d599e360b0.js

2369 ms

99391-4c620f2f57abd838.js

99391-4c620f2f57abd838.js

2373 ms

15407-8aca8b1e2bcacdd4.js

15407-8aca8b1e2bcacdd4.js

2479 ms

3565-c6a82fbdb3044c8a.js

3565-c6a82fbdb3044c8a.js

2536 ms

1953-c231762b0def4a15.js

1953-c231762b0def4a15.js

2629 ms

index-7fd029ba1ef6af14.js

index-7fd029ba1ef6af14.js

2873 ms

_buildManifest.js

_buildManifest.js

1935 ms

_ssgManifest.js

_ssgManifest.js

1997 ms

image

image

2075 ms

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_TknNSQ.woff

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_TknNSQ.woff

43 ms

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_KUnNSQ.woff

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_KUnNSQ.woff

137 ms

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_d0nNSQ.woff

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_d0nNSQ.woff

180 ms

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_m07NSQ.woff

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_m07NSQ.woff

180 ms

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_qU7NSQ.woff

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_qU7NSQ.woff

181 ms

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_907NSQ.woff

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_907NSQ.woff

181 ms

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_KU7NSQ.woff

LDIbaomQNQcsA88c7O9yZ4KMCoOg4IA6-91aHEjcWuA_KU7NSQ.woff

179 ms

Accessibility Review

zim.vn accessibility score

82

Accessibility Issues

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

zim.vn best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

zim.vn SEO score

93

Search Engine Optimization Advices

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

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 Zim.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 Zim.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

zim.vn

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