Tools & Wizards About Us
cdi.co.kr screenshot

Report Summary

  • 7

    Performance

    Renders faster than
    22% of other websites

  • 80

    Accessibility

    Visual factors better than
    that of 49% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 96

    SEO

    Google-friendlier than
    90% of websites

cdi.co.kr

청담어학원 | April어학원 | CMS 영재교육센터 | CMS 영재관

Page Load Speed

15.9 sec in total

First Response

875 ms

Resources Loaded

12.6 sec

Page Rendered

2.3 sec

cdi.co.kr screenshot

About Website

Welcome to cdi.co.kr homepage info - get ready to check Cdi best content right away, or after learning these important things about cdi.co.kr

크레버스(CREVERSE)의 언어, 수리 융합 사고력 브랜드. 글로벌 인재를 양성하는 미래교육. 청담어학원, April어학원, CMS 영재교육센터(사고력관), CMS 영재관 브랜드 소개 내용 제공

Visit cdi.co.kr

Key Findings

We analyzed Cdi.co.kr page load time and found that the first response time was 875 ms and then it took 15 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.

Performance Metrics

cdi.co.kr performance score

7

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.7 s

5/100

10%

LCP (Largest Contentful Paint)

Value28.8 s

0/100

25%

SI (Speed Index)

Value43.6 s

0/100

10%

TBT (Total Blocking Time)

Value50,550 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.292

41/100

15%

TTI (Time to Interactive)

Value69.1 s

0/100

10%

Network Requests Diagram

cdi.co.kr

875 ms

www.chungdahm.com

606 ms

www.chungdahm.com

1102 ms

global.css

521 ms

common.css

993 ms

Our browser made a total of 172 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Cdi.co.kr, 48% (83 requests) were made to Chungdahm.com and 15% (25 requests) were made to Image.chungdahm.com. The less responsive or slowest element that took the longest time to load (8.7 sec) relates to the external source Image.chungdahm.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 660.9 kB (17%)

Content Size

3.8 MB

After Optimization

3.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Cdi.co.kr main page is 3.8 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. Only a small number of websites need less resources to load. Images take 3.4 MB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 77.8 kB

  • Original 94.9 kB
  • After minification 76.4 kB
  • After compression 17.0 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 18.4 kB, which is 19% 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 77.8 kB or 82% of the original size.

Image Optimization

-14%

Potential reduce by 484.5 kB

  • Original 3.4 MB
  • After minification 2.9 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, Cdi needs image optimization as it can save up to 484.5 kB or 14% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-36%

Potential reduce by 92.8 kB

  • Original 258.4 kB
  • After minification 258.2 kB
  • After compression 165.6 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 92.8 kB or 36% of the original size.

CSS Optimization

-8%

Potential reduce by 5.7 kB

  • Original 69.8 kB
  • After minification 69.8 kB
  • After compression 64.2 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. Cdi.co.kr has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 67 (42%)

Requests Now

160

After Optimization

93

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 160 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Cdi. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 41 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

cdi.co.kr

cdi.co.kr

875 ms

www.chungdahm.com

www.chungdahm.com

606 ms

www.chungdahm.com

www.chungdahm.com

1102 ms

global.css

global.css

521 ms

common.css

common.css

993 ms

css2

css2

91 ms

main.css

main.css

1022 ms

after.png

after.png

8730 ms

www.chungdahm.com

www.chungdahm.com

1590 ms

ui.vendor.js

ui.vendor.js

1588 ms

ui.js

ui.js

1579 ms

lodash.min.js

lodash.min.js

767 ms

vue.min.js

vue.min.js

837 ms

vue2-filters.min.js

vue2-filters.min.js

562 ms

numeral.min.js

numeral.min.js

836 ms

clipboard.min.js

clipboard.min.js

852 ms

isMobile.min.js

isMobile.min.js

804 ms

js.cookie.min.js

js.cookie.min.js

836 ms

loader.js

loader.js

801 ms

messages.js

messages.js

1575 ms

geolocation.js

geolocation.js

1722 ms

share.js

share.js

1755 ms

app.js

app.js

1868 ms

js

js

782 ms

kp.js

kp.js

847 ms

js

js

782 ms

index.js

index.js

1798 ms

maxresdefault.jpg

maxresdefault.jpg

3934 ms

%ED%81%AC%EB%A0%88%EB%B2%84%EC%8A%A4-%EB%B3%B5%ED%95%A9%EA%B4%80(4).png

%ED%81%AC%EB%A0%88%EB%B2%84%EC%8A%A4-%EB%B3%B5%ED%95%A9%EA%B4%80(4).png

3218 ms

%ED%8F%89%EC%B4%8C.jpg

%ED%8F%89%EC%B4%8C.jpg

3218 ms

KakaoTalk_20220401_114232645.jpg

KakaoTalk_20220401_114232645.jpg

3986 ms

dayjs@1.11.5

dayjs@1.11.5

19 ms

dayjs.min.js

dayjs.min.js

27 ms

CI_default.svg

CI_default.svg

839 ms

sprite-layout.png

sprite-layout.png

1458 ms

dropdown.png

dropdown.png

873 ms

bi_eLibrary.png

bi_eLibrary.png

954 ms

sprite.png

sprite.png

2908 ms

i-sel-4.png

i-sel-4.png

1312 ms

cdi-logo.png

cdi-logo.png

1312 ms

cdi.png

cdi.png

1664 ms

april-logo.png

april-logo.png

1312 ms

april.png

april.png

2189 ms

ig-logo.png

ig-logo.png

2189 ms

ig.png

ig.png

2189 ms

pbp-logo.png

pbp-logo.png

2864 ms

pbp.png

pbp.png

3306 ms

cmt-logo.png

cmt-logo.png

3305 ms

cmt.png

cmt.png

3305 ms

cms-logo.png

cms-logo.png

3305 ms

cms.png

cms.png

3413 ms

c3-logo.png

c3-logo.png

3412 ms

c3.png

c3.png

3925 ms

bouncy-logo.png

bouncy-logo.png

3611 ms

bouncy.png

bouncy.png

3952 ms

nosiy-logo.png

nosiy-logo.png

3611 ms

nosiy.png

nosiy.png

3927 ms

edge-logo.png

edge-logo.png

3860 ms

edge.png

edge.png

4097 ms

alive-logo.png

alive-logo.png

3926 ms

alive.png

alive.png

4274 ms

PbykFmXiEBPT4ITbgNA5Cgm20A.otf

PbykFmXiEBPT4ITbgNA5Cgm20A.otf

565 ms

Pby7FmXiEBPT4ITbgNA5CgmOIl3I7g.otf

Pby7FmXiEBPT4ITbgNA5CgmOIl3I7g.otf

5242 ms

Pby7FmXiEBPT4ITbgNA5CgmOelzI7g.otf

Pby7FmXiEBPT4ITbgNA5CgmOelzI7g.otf

5668 ms

Pby6FmXiEBPT4ITbgNA5CgmOsn7u.otf

Pby6FmXiEBPT4ITbgNA5CgmOsn7u.otf

4997 ms

Pby7FmXiEBPT4ITbgNA5CgmOalvI7g.otf

Pby7FmXiEBPT4ITbgNA5CgmOalvI7g.otf

5713 ms

Pby7FmXiEBPT4ITbgNA5CgmOUlnI7g.otf

Pby7FmXiEBPT4ITbgNA5CgmOUlnI7g.otf

5714 ms

global.css

global.css

3717 ms

common.css

common.css

3649 ms

main.css

main.css

3508 ms

ui.vendor.js

ui.vendor.js

3994 ms

kids-logo.png

kids-logo.png

4030 ms

kids.png

kids.png

3969 ms

creversex-logo.png

creversex-logo.png

3917 ms

creversex.png

creversex.png

3904 ms

campus-logo.png

campus-logo.png

4116 ms

campus.png

campus.png

4082 ms

gtm.js

gtm.js

81 ms

conversion_async.js

conversion_async.js

682 ms

analytics.js

analytics.js

1780 ms

bigin.sdk.js

bigin.sdk.js

3350 ms

wcslog.js

wcslog.js

2113 ms

fbevents.js

fbevents.js

1731 ms

js

js

238 ms

abx-web-sdk.min.js

abx-web-sdk.min.js

2165 ms

events.js

events.js

2243 ms

gen_204

gen_204

1509 ms

Sprev-w.png

Sprev-w.png

3291 ms

Snext-w.png

Snext-w.png

3310 ms

1864 ms

1214 ms

swipe-guide.png

swipe-guide.png

2090 ms

CDbanner_1920.jpg

CDbanner_1920.jpg

1066 ms

banner_1920.jpg

banner_1920.jpg

963 ms

banner_1920.jpg

banner_1920.jpg

1712 ms

banner_1920(6).jpg

banner_1920(6).jpg

1067 ms

banner_1920.png

banner_1920.png

1869 ms

mid_banner_730(1).jpg

mid_banner_730(1).jpg

1870 ms

CDmid_banner_730.jpg

CDmid_banner_730.jpg

1277 ms

mid_banner_730.png

mid_banner_730.png

1836 ms

mid_banner_730.jpg

mid_banner_730.jpg

1837 ms

mid_banner_730.png

mid_banner_730.png

2102 ms

556938345777497

556938345777497

481 ms

collect

collect

330 ms

616 ms

s.gif

s.gif

394 ms

66a200b88f3d71e8b9d2dbb8dbbf363507fb9865f4c98de131ff85ff5ae4ccce.json

66a200b88f3d71e8b9d2dbb8dbbf363507fb9865f4c98de131ff85ff5ae4ccce.json

331 ms

m

m

1414 ms

main.Mi4wLjAuNTVfMQ.js

main.Mi4wLjAuNTVfMQ.js

337 ms

collect

collect

964 ms

432708560940790

432708560940790

222 ms

861 ms

918 ms

s.gif

s.gif

574 ms

CI_default.svg

CI_default.svg

609 ms

icon_more.svg

icon_more.svg

844 ms

cdi-logo.png

cdi-logo.png

842 ms

cdi.png

cdi.png

1042 ms

april-logo.png

april-logo.png

841 ms

april.png

april.png

842 ms

ig-logo.png

ig-logo.png

841 ms

ig.png

ig.png

1337 ms

pbp-logo.png

pbp-logo.png

1336 ms

pbp.png

pbp.png

1335 ms

cmt-logo.png

cmt-logo.png

1336 ms

cmt.png

cmt.png

1835 ms

cms-logo.png

cms-logo.png

1832 ms

cms.png

cms.png

1831 ms

c3-logo.png

c3-logo.png

1830 ms

c3.png

c3.png

1830 ms

bouncy-logo.png

bouncy-logo.png

1830 ms

bouncy.png

bouncy.png

1870 ms

nosiy-logo.png

nosiy-logo.png

1873 ms

nosiy.png

nosiy.png

1874 ms

edge-logo.png

edge-logo.png

1870 ms

edge.png

edge.png

1871 ms

alive-logo.png

alive-logo.png

1872 ms

sprite-mo.png

sprite-mo.png

2345 ms

sprite-layout-mo.png

sprite-layout-mo.png

2550 ms

ga-audiences

ga-audiences

319 ms

i

i

1577 ms

%2F

%2F

1394 ms

app.js

app.js

1307 ms

common.js

common.js

77 ms

util.js

util.js

78 ms

99 ms

collect

collect

86 ms

i

i

196 ms

123 ms

m

m

341 ms

66a200b88f3d71e8b9d2dbb8dbbf363507fb9865f4c98de131ff85ff5ae4ccce.json

66a200b88f3d71e8b9d2dbb8dbbf363507fb9865f4c98de131ff85ff5ae4ccce.json

30 ms

%2F%23none

%2F%23none

239 ms

229 ms

events.js

events.js

33 ms

31 ms

gen_204

gen_204

169 ms

Sprev-w.png

Sprev-w.png

352 ms

Snext-w.png

Snext-w.png

234 ms

38 ms

main.Mi4wLjAuNTVfMQ.js

main.Mi4wLjAuNTVfMQ.js

31 ms

s.gif

s.gif

18 ms

banner_640.png

banner_640.png

587 ms

banner_640(1).jpg

banner_640(1).jpg

571 ms

banner_640.jpg

banner_640.jpg

1158 ms

banner_640(3).png

banner_640(3).png

782 ms

banner_640.jpg

banner_640.jpg

563 ms

mid_banner_640.png

mid_banner_640.png

230 ms

CDmid_banner_640.jpg

CDmid_banner_640.jpg

423 ms

mid_banner_640.jpg

mid_banner_640.jpg

805 ms

mid_banner_640(2).jpg

mid_banner_640(2).jpg

749 ms

mid_banner_640(2).png

mid_banner_640(2).png

759 ms

swipe-guide-mo.png

swipe-guide-mo.png

196 ms

Accessibility Review

cdi.co.kr accessibility score

80

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

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

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.

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

<dl>'s do not contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements.

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

cdi.co.kr best practices score

75

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

cdi.co.kr SEO score

96

Search Engine Optimization Advices

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

    KO

  • Language Claimed

    KO

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Cdi.co.kr can be misinterpreted by Google and other search engines. Our service has detected that Korean is used on the page, and it matches the claimed language. Our system also found out that Cdi.co.kr 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

cdi.co.kr

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