Tools & Wizards About Us
codecamp.jp screenshot

Report Summary

  • 20

    Performance

    Renders faster than
    38% of other websites

  • 61

    Accessibility

    Visual factors better than
    that of 27% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    82% of websites

  • 93

    SEO

    Google-friendlier than
    84% of websites

codecamp.jp

プログラミング学ぶなら、オンラインレッスンNo.1 | オンラインプログラミングスクールCodeCamp（コードキャンプ）

Page Load Speed

4.9 sec in total

First Response

506 ms

Resources Loaded

3.4 sec

Page Rendered

992 ms

codecamp.jp screenshot

About Website

Welcome to codecamp.jp homepage info - get ready to check Codecamp best content for Japan right away, or after learning these important things about codecamp.jp

CodeCamp（コードキャンプ）はオンラインのプログラミング/Webデザイン学習サービス。実践型カリキュラムで、技術力/指導力を備えた講師が徹底的に指導。DXを実現するなら、オンラインのプログラミング/Webデザイン学習CodeCamp

Visit codecamp.jp

Key Findings

We analyzed Codecamp.jp page load time and found that the first response time was 506 ms and then it took 4.4 sec to load all DOM resources and completely render a web page. This is a poor result, as 65% of websites can load faster.

Performance Metrics

codecamp.jp performance score

20

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.0 s

9/100

10%

LCP (Largest Contentful Paint)

Value11.9 s

0/100

25%

SI (Speed Index)

Value10.1 s

9/100

10%

TBT (Total Blocking Time)

Value1,830 ms

9/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value22.2 s

1/100

10%

Network Requests Diagram

codecamp.jp

506 ms

application-0196f746f5ec6ae4a1da5e52afb17bcd9922abaa17ac4afeb2d798171758105b.css

1257 ms

react-7368c1e52d41460fa3633b4d211039115f569db526b42d29ab66f9ad1db5ca4b.js

1535 ms

static_pages-8c34f908cc01829bb73bf2d11ea0479f71a8a41da1c3603014738076ceb6688d.js

1924 ms

gtm.js

119 ms

Our browser made a total of 56 requests to load all elements on the main page. We found that 4% of them (2 requests) were addressed to the original Codecamp.jp, 50% (28 requests) were made to S3-ap-northeast-1.amazonaws.com and 7% (4 requests) were made to S.ytimg.com. The less responsive or slowest element that took the longest time to load (1.9 sec) relates to the external source S3-ap-northeast-1.amazonaws.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.1 MB (58%)

Content Size

1.9 MB

After Optimization

785.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Codecamp.jp main page is 1.9 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. 45% of websites need less resources to load. Javascripts take 874.3 kB which makes up the majority of the site volume.

HTML Optimization

-74%

Potential reduce by 67.4 kB

  • Original 90.8 kB
  • After minification 90.4 kB
  • After compression 23.4 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 67.4 kB or 74% of the original size.

Image Optimization

-9%

Potential reduce by 44.6 kB

  • Original 503.0 kB
  • After minification 458.4 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. Codecamp images are well optimized though.

JavaScript Optimization

-72%

Potential reduce by 632.4 kB

  • Original 874.3 kB
  • After minification 817.1 kB
  • After compression 241.8 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 632.4 kB or 72% of the original size.

CSS Optimization

-85%

Potential reduce by 344.6 kB

  • Original 406.5 kB
  • After minification 405.8 kB
  • After compression 61.9 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. Codecamp.jp needs all CSS files to be minified and compressed as it can save up to 344.6 kB or 85% of the original size.

Requests Breakdown

Number of requests can be reduced by 21 (41%)

Requests Now

51

After Optimization

30

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 51 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Codecamp. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 15 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

codecamp.jp

codecamp.jp

506 ms

application-0196f746f5ec6ae4a1da5e52afb17bcd9922abaa17ac4afeb2d798171758105b.css

application-0196f746f5ec6ae4a1da5e52afb17bcd9922abaa17ac4afeb2d798171758105b.css

1257 ms

react-7368c1e52d41460fa3633b4d211039115f569db526b42d29ab66f9ad1db5ca4b.js

react-7368c1e52d41460fa3633b4d211039115f569db526b42d29ab66f9ad1db5ca4b.js

1535 ms

static_pages-8c34f908cc01829bb73bf2d11ea0479f71a8a41da1c3603014738076ceb6688d.js

static_pages-8c34f908cc01829bb73bf2d11ea0479f71a8a41da1c3603014738076ceb6688d.js

1924 ms

gtm.js

gtm.js

119 ms

analytics.js

analytics.js

117 ms

logo-17538f84ed9e710070a544f3869396822a6c7fd852a9ff0d58b0f43fe1704b3b.png

logo-17538f84ed9e710070a544f3869396822a6c7fd852a9ff0d58b0f43fe1704b3b.png

172 ms

black-dot-17ec61be24988d6f009f35951e1edb4f719974dd54241e17cd23fb666fbb230e.png

black-dot-17ec61be24988d6f009f35951e1edb4f719974dd54241e17cd23fb666fbb230e.png

346 ms

logo_white-58c4a28f5ccf27eff203dfe5e11b171d0b6c82786fc8f929c496215f0731ef90.png

logo_white-58c4a28f5ccf27eff203dfe5e11b171d0b6c82786fc8f929c496215f0731ef90.png

526 ms

icon01-01dafcbb6db820a72302d729af0769e7a72250f10586f19cd312017912619cac.png

icon01-01dafcbb6db820a72302d729af0769e7a72250f10586f19cd312017912619cac.png

550 ms

image01-c08358eeaf3e78c352e500f17facc17f210ba8700eb473abd2a76856ff78a36b.png

image01-c08358eeaf3e78c352e500f17facc17f210ba8700eb473abd2a76856ff78a36b.png

626 ms

original.png

original.png

967 ms

original.png

original.png

970 ms

original.png

original.png

763 ms

image02-ac43b04ed496383300a2f5a3f2349410f151b540f72ccc358fe01fa4d9f2bdb2.png

image02-ac43b04ed496383300a2f5a3f2349410f151b540f72ccc358fe01fa4d9f2bdb2.png

970 ms

image03-dce45603626bd4a77216d5d4d7c7afe1ea649ac7ffc63def1354002485913976.png

image03-dce45603626bd4a77216d5d4d7c7afe1ea649ac7ffc63def1354002485913976.png

969 ms

serviceSymbols-2649042a3f59a9c1dc477c8297ee0022cff45ed79befcce106139cec20f5c80d.png

serviceSymbols-2649042a3f59a9c1dc477c8297ee0022cff45ed79befcce106139cec20f5c80d.png

1101 ms

loading-30.gif

loading-30.gif

970 ms

15.JPG

15.JPG

1007 ms

21.JPG

21.JPG

1013 ms

18.jpg

18.jpg

1145 ms

16.jpeg

16.jpeg

1290 ms

corporateSymbols-419838bfbfda72b46826dd3bcbebb911e838c584dd3aa7a1a8398460b196caa9.png

corporateSymbols-419838bfbfda72b46826dd3bcbebb911e838c584dd3aa7a1a8398460b196caa9.png

1160 ms

pta.js

pta.js

363 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

592 ms

collect

collect

23 ms

collect

collect

55 ms

ct_tag.php

ct_tag.php

531 ms

conversion_async.js

conversion_async.js

16 ms

42 ms

36 ms

290e2f57.js

290e2f57.js

556 ms

seo.php

seo.php

650 ms

s_retargeting.js

s_retargeting.js

675 ms

fql.query

fql.query

165 ms

iframe_api

iframe_api

160 ms

image05-2-fa24b65a1e26abcbcab939e5fc9252d8c895366991bd2e97e468b79474dce0be.png

image05-2-fa24b65a1e26abcbcab939e5fc9252d8c895366991bd2e97e468b79474dce0be.png

551 ms

image04-2-8dd9db78407358491524192c74d1f36113244ba404aa3e5dc41e47e05d66c19e.png

image04-2-8dd9db78407358491524192c74d1f36113244ba404aa3e5dc41e47e05d66c19e.png

315 ms

image06-2-7c6ee00d11673415d328721e959a928cb1b8893fa1f143eb6d76efba12755649.png

image06-2-7c6ee00d11673415d328721e959a928cb1b8893fa1f143eb6d76efba12755649.png

320 ms

professional_02-ed8efcc47cbf6d1d3ac3bf080a5412c7a26c5d0091ee774e2a62c5161e948b4c.jpg

professional_02-ed8efcc47cbf6d1d3ac3bf080a5412c7a26c5d0091ee774e2a62c5161e948b4c.jpg

560 ms

professional_04-25cb40d764dce9abd0d55b2f129fcedacaa1f4c7cd66ec5a8f26495e3572d8be.jpg

professional_04-25cb40d764dce9abd0d55b2f129fcedacaa1f4c7cd66ec5a8f26495e3572d8be.jpg

389 ms

professional_01-b784744f0abd5a4c5e84e5eb63f060b1e1d4cd08a5a131e76914d964e62f50af.jpg

professional_01-b784744f0abd5a4c5e84e5eb63f060b1e1d4cd08a5a131e76914d964e62f50af.jpg

559 ms

professional_05-832fabd6066b9add22ac6d0b90647eb7c309cc4140b3cb5bd639079264db045f.jpg

professional_05-832fabd6066b9add22ac6d0b90647eb7c309cc4140b3cb5bd639079264db045f.jpg

561 ms

rogo_codebu-0559a57965781ab9cbb2b1e4480912e8c84d8c96af75fb78c5040002a0b95672.png

rogo_codebu-0559a57965781ab9cbb2b1e4480912e8c84d8c96af75fb78c5040002a0b95672.png

560 ms

pn

pn

489 ms

www-widgetapi.js

www-widgetapi.js

54 ms

ruXLk9U14rc

ruXLk9U14rc

83 ms

www-embed-player-vflQrT_sR.css

www-embed-player-vflQrT_sR.css

21 ms

www-embed-player.js

www-embed-player.js

77 ms

base.js

base.js

147 ms

MdyApZkAHG2-UELdOwjNjjFZXSz-CGj4o1JtDR7aGgs.js

MdyApZkAHG2-UELdOwjNjjFZXSz-CGj4o1JtDR7aGgs.js

24 ms

ad_status.js

ad_status.js

67 ms

2UX7WLTfW3W8TclTUvlFyQ.woff

2UX7WLTfW3W8TclTUvlFyQ.woff

70 ms

RxZJdnzeo3R5zSexge8UUT8E0i7KZn-EPnyo3HZu7kw.woff

RxZJdnzeo3R5zSexge8UUT8E0i7KZn-EPnyo3HZu7kw.woff

77 ms

fbds.js

fbds.js

152 ms

25 ms

Accessibility Review

codecamp.jp accessibility score

61

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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

codecamp.jp 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

codecamp.jp 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

    JA

  • Language Claimed

    JA

  • Encoding

    UTF-8

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

codecamp.jp

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