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os.ckc.co.jp screenshot

Report Summary

  • 100

    Performance

    Renders faster than
    97% of other websites

  • 84

    Accessibility

    Visual factors better than
    that of 57% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 58

    SEO

    Google-friendlier than
    20% of websites

os.ckc.co.jp

Info

Page Load Speed

7 sec in total

First Response

656 ms

Resources Loaded

6 sec

Page Rendered

354 ms

os.ckc.co.jp screenshot

About Website

Click here to check amazing Os Ckc content for Japan. Otherwise, check out these important facts you probably never knew about os.ckc.co.jp

インターネット経由で一人ひとりにあった学習指導を提供するオンラインゼミの公式サイトです。英会話や、小学講座から中学講座、高校講座、英検対策、不登校児童生徒のサポートまで、様々な個別の指導を提供します。

Visit os.ckc.co.jp

Key Findings

We analyzed Os.ckc.co.jp page load time and found that the first response time was 656 ms and then it took 6.3 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

os.ckc.co.jp performance score

100

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value0.6 s

100/100

10%

LCP (Largest Contentful Paint)

Value0.6 s

100/100

25%

SI (Speed Index)

Value0.6 s

100/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value0.6 s

100/100

10%

Network Requests Diagram

www.onlinezemi.com

656 ms

base.css

378 ms

lightbox.css

383 ms

style.css

407 ms

common.css

630 ms

Our browser made a total of 129 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Os.ckc.co.jp, 4% (5 requests) were made to Staging.onlinezemi.com and 3% (4 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (2.6 sec) relates to the external source Onlinezemi.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 307.0 kB (21%)

Content Size

1.5 MB

After Optimization

1.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Os.ckc.co.jp 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. 50% of websites need less resources to load. Images take 1.1 MB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 23.4 kB

  • Original 29.7 kB
  • After minification 25.2 kB
  • After compression 6.4 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. This page needs HTML code to be minified as it can gain 4.6 kB, which is 15% 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 23.4 kB or 79% of the original size.

Image Optimization

-5%

Potential reduce by 57.1 kB

  • Original 1.1 MB
  • After minification 1.0 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. Os Ckc images are well optimized though.

JavaScript Optimization

-63%

Potential reduce by 162.1 kB

  • Original 259.0 kB
  • After minification 222.6 kB
  • After compression 96.8 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 162.1 kB or 63% of the original size.

CSS Optimization

-86%

Potential reduce by 64.5 kB

  • Original 74.8 kB
  • After minification 55.7 kB
  • After compression 10.3 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. Os.ckc.co.jp needs all CSS files to be minified and compressed as it can save up to 64.5 kB or 86% of the original size.

Requests Breakdown

Number of requests can be reduced by 43 (40%)

Requests Now

107

After Optimization

64

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 107 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Os Ckc. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 18 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

www.onlinezemi.com

www.onlinezemi.com

656 ms

base.css

base.css

378 ms

lightbox.css

lightbox.css

383 ms

style.css

style.css

407 ms

common.css

common.css

630 ms

style.css

style.css

422 ms

flexslider.css

flexslider.css

419 ms

prettyPhoto.css

prettyPhoto.css

759 ms

jiji_1003_05.png

jiji_1003_05.png

669 ms

side_img_09.png

side_img_09.png

684 ms

side_img_10.png

side_img_10.png

506 ms

side_img_11.png

side_img_11.png

696 ms

head_logo.gif

head_logo.gif

619 ms

order_btn_01.gif

order_btn_01.gif

622 ms

order_btn_02.png

order_btn_02.png

624 ms

menu_icon_001.gif

menu_icon_001.gif

624 ms

menu_icon_002.gif

menu_icon_002.gif

796 ms

main_10.png

main_10.png

2559 ms

main_img_002.jpg

main_img_002.jpg

1582 ms

main_img_003.jpg

main_img_003.jpg

1439 ms

main_img_004.jpg

main_img_004.jpg

1645 ms

top_h2_04.gif

top_h2_04.gif

941 ms

top_h2_01.png

top_h2_01.png

949 ms

course_img_01_sp_03.gif

course_img_01_sp_03.gif

1323 ms

course_img_02.gif

course_img_02.gif

1515 ms

course_img_03.gif

course_img_03.gif

1704 ms

course_img_04.gif

course_img_04.gif

1853 ms

course_img_05.gif

course_img_05.gif

1895 ms

side_h3_1.png

side_h3_1.png

1786 ms

%EF%BD%B5%EF%BE%9D%EF%BE%97%EF%BD%B2%EF%BE%9D%EF%BD%BE%EF%BE%9E%EF%BE%90%E3%81%A8%E3%81%AF%EF%BC%9F.png

%EF%BD%B5%EF%BE%9D%EF%BE%97%EF%BD%B2%EF%BE%9D%EF%BD%BE%EF%BE%9E%EF%BE%90%E3%81%A8%E3%81%AF%EF%BC%9F.png

1858 ms

%E5%B0%8F%E5%AD%A6%E7%94%9F%E3%81%AE%E6%8E%88%E6%A5%AD.png

%E5%B0%8F%E5%AD%A6%E7%94%9F%E3%81%AE%E6%8E%88%E6%A5%AD.png

1909 ms

%E4%B8%AD%E5%AD%A6%E7%94%9F%E3%81%AE%E6%8E%88%E6%A5%AD.png

%E4%B8%AD%E5%AD%A6%E7%94%9F%E3%81%AE%E6%8E%88%E6%A5%AD.png

1995 ms

side_h3_01.gif

side_h3_01.gif

2062 ms

side_img_01.gif

side_img_01.gif

2069 ms

side_img_02.png

side_img_02.png

2094 ms

side_img_01_03.png

side_img_01_03.png

2103 ms

side_img_01_06.png

side_img_01_06.png

2205 ms

like.php

like.php

91 ms

qeKvIRsJabD.js

qeKvIRsJabD.js

289 ms

LVx-xkvaJ0b.png

LVx-xkvaJ0b.png

324 ms

jquery.js

jquery.js

2562 ms

easing.js

easing.js

2124 ms

lightbox.js

lightbox.js

2133 ms

conversion.js

conversion.js

16 ms

s_retargeting.js

s_retargeting.js

533 ms

jquery.flexslider.js

jquery.flexslider.js

2326 ms

jquery.prettyPhoto.js

jquery.prettyPhoto.js

2261 ms

script.js

script.js

2134 ms

jquery.scrolldepth.min.js

jquery.scrolldepth.min.js

2108 ms

qeKvIRsJabD.js

qeKvIRsJabD.js

120 ms

widgets.js

widgets.js

79 ms

order_btn_01.gif

order_btn_01.gif

179 ms

head_bg_001.gif

head_bg_001.gif

1931 ms

order_btn_01_off.png

order_btn_01_off.png

1941 ms

order_btn_02_off.png

order_btn_02_off.png

1963 ms

image10-1.png

image10-1.png

2032 ms

course_img_01_02.gif

course_img_01_02.gif

2087 ms

course_img_02.gif

course_img_02.gif

2125 ms

course_img_03.gif

course_img_03.gif

2132 ms

course_img_04.gif

course_img_04.gif

2141 ms

course_img_05.gif

course_img_05.gif

2148 ms

side_img_01.gif

side_img_01.gif

2042 ms

side_img_02.gif

side_img_02.gif

2091 ms

banner6.png

banner6.png

1762 ms

side_img_03.png

side_img_03.png

1654 ms

jiji_1003_05.png

jiji_1003_05.png

1634 ms

side_img_09.png

side_img_09.png

1575 ms

side_img_10.png

side_img_10.png

1546 ms

side_img_11.png

side_img_11.png

1545 ms

order_btn_021_off.png

order_btn_021_off.png

1494 ms

order_btn_02_01.png

order_btn_02_01.png

1433 ms

order_img_01.gif

order_img_01.gif

1501 ms

btn_pagetop_off.gif

btn_pagetop_off.gif

1469 ms

btn_pagetop.gif

btn_pagetop.gif

1483 ms

50 ms

blade_track_jp.js

blade_track_jp.js

431 ms

item.js

item.js

351 ms

ga.js

ga.js

40 ms

button.0308b81ff1714e446f674b5b9793f2cd.js

button.0308b81ff1714e446f674b5b9793f2cd.js

137 ms

59 ms

__utm.gif

__utm.gif

27 ms

__utm.gif

__utm.gif

22 ms

__utm.gif

__utm.gif

24 ms

tweet_button.b9740740e0bcf9b0657c5b11bd4388da.ja.html

tweet_button.b9740740e0bcf9b0657c5b11bd4388da.ja.html

38 ms

jot

jot

96 ms

KcDeqwasAgent.js

KcDeqwasAgent.js

150 ms

cookie_enabled_get.html

cookie_enabled_get.html

367 ms

Collection.aspx

Collection.aspx

154 ms

rtbsync.js

rtbsync.js

17 ms

Sync.aspx

Sync.aspx

301 ms

Sync.aspx

Sync.aspx

319 ms

Sync.aspx

Sync.aspx

315 ms

Sync.aspx

Sync.aspx

317 ms

Sync.aspx

Sync.aspx

307 ms

Sync.aspx

Sync.aspx

328 ms

Sync.aspx

Sync.aspx

328 ms

Sync.aspx

Sync.aspx

320 ms

Sync.aspx

Sync.aspx

317 ms

Sync.aspx

Sync.aspx

310 ms

Sync.aspx

Sync.aspx

344 ms

Sync.aspx

Sync.aspx

311 ms

Sync.aspx

Sync.aspx

331 ms

Sync.aspx

Sync.aspx

334 ms

Sync.aspx

Sync.aspx

335 ms

Sync.aspx

Sync.aspx

326 ms

DynamicRetargetUserSync.aspx

DynamicRetargetUserSync.aspx

358 ms

Collection.aspx

Collection.aspx

360 ms

bl_track.cgi

bl_track.cgi

372 ms

Sync.aspx

Sync.aspx

481 ms

cookiesync

cookiesync

352 ms

sync

sync

516 ms

300 ms

tap.php

tap.php

28 ms

cs

cs

345 ms

sync

sync

19 ms

sd

sd

25 ms

Collection.aspx

Collection.aspx

150 ms

mapuser

mapuser

153 ms

Collection.aspx

Collection.aspx

155 ms

Collection.aspx

Collection.aspx

167 ms

pixel

pixel

24 ms

Collection.aspx

Collection.aspx

154 ms

Collection.aspx

Collection.aspx

152 ms

Collection.aspx

Collection.aspx

158 ms

Collection.aspx

Collection.aspx

156 ms

Collection.aspx

Collection.aspx

305 ms

main_navi.png

main_navi.png

197 ms

main_arrow_001.png

main_arrow_001.png

195 ms

main_arrow_002.png

main_arrow_002.png

213 ms

Accessibility Review

os.ckc.co.jp accessibility score

84

Accessibility Issues

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

os.ckc.co.jp best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

SEO Factors

os.ckc.co.jp SEO score

58

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

robots.txt is not valid

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 Os.ckc.co.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 Os.ckc.co.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

os.ckc.co.jp

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