Tools & Wizards About Us
kaibunsha.co.jp screenshot

Report Summary

  • 41

    Performance

    Renders faster than
    60% of other websites

  • 79

    Accessibility

    Visual factors better than
    that of 47% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 98

    SEO

    Google-friendlier than
    92% of websites

kaibunsha.co.jp

英語教科書・研究書・単行本の開文社出版｜音声サンプルあり｜ホーム

Page Load Speed

6.4 sec in total

First Response

595 ms

Resources Loaded

5.3 sec

Page Rendered

543 ms

kaibunsha.co.jp screenshot

About Website

Welcome to kaibunsha.co.jp homepage info - get ready to check Kaibunsha best content right away, or after learning these important things about kaibunsha.co.jp

英語教科書・研究書・単行本の開文社出版のオフィシャルページです。購入・現在教育機関で授業をお持ちの先生方にテキストのご採用を検討していただくための見本請求はこちらから。音声サンプルもご用意しております。

Visit kaibunsha.co.jp

Key Findings

We analyzed Kaibunsha.co.jp page load time and found that the first response time was 595 ms and then it took 5.8 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

kaibunsha.co.jp performance score

41

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.2 s

8/100

10%

LCP (Largest Contentful Paint)

Value15.3 s

0/100

25%

SI (Speed Index)

Value17.7 s

0/100

10%

TBT (Total Blocking Time)

Value250 ms

84/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value33.3 s

0/100

10%

Network Requests Diagram

kaibunsha.co.jp

595 ms

www.kaibunsha.co.jp

515 ms

www.kaibunsha.co.jp

1078 ms

bootstrap.css

353 ms

bootstrap4-print.css

519 ms

Our browser made a total of 51 requests to load all elements on the main page. We found that 92% of them (47 requests) were addressed to the original Kaibunsha.co.jp, 4% (2 requests) were made to Fonts.gstatic.com and 2% (1 request) were made to Fonts.googleapis.com. The less responsive or slowest element that took the longest time to load (2.1 sec) belongs to the original domain Kaibunsha.co.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 212.7 kB (6%)

Content Size

3.8 MB

After Optimization

3.6 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Kaibunsha.co.jp 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. 45% of websites need less resources to load. Images take 3.6 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 27.5 kB

  • Original 33.8 kB
  • After minification 33.1 kB
  • After compression 6.3 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 27.5 kB or 81% of the original size.

Image Optimization

-5%

Potential reduce by 164.7 kB

  • Original 3.6 MB
  • After minification 3.4 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. Kaibunsha images are well optimized though.

JavaScript Optimization

-19%

Potential reduce by 12.2 kB

  • Original 65.1 kB
  • After minification 64.8 kB
  • After compression 52.9 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 12.2 kB or 19% of the original size.

CSS Optimization

-12%

Potential reduce by 8.3 kB

  • Original 68.9 kB
  • After minification 68.9 kB
  • After compression 60.6 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. Kaibunsha.co.jp needs all CSS files to be minified and compressed as it can save up to 8.3 kB or 12% of the original size.

Requests Breakdown

Number of requests can be reduced by 17 (40%)

Requests Now

42

After Optimization

25

  • Images
  • JavaScript
  • CSS

The browser has sent 42 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Kaibunsha. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts and from 9 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

kaibunsha.co.jp

kaibunsha.co.jp

595 ms

www.kaibunsha.co.jp

www.kaibunsha.co.jp

515 ms

www.kaibunsha.co.jp

www.kaibunsha.co.jp

1078 ms

bootstrap.css

bootstrap.css

353 ms

bootstrap4-print.css

bootstrap4-print.css

519 ms

bootstrap-custom.css

bootstrap-custom.css

522 ms

drawer_menu.css

drawer_menu.css

528 ms

aos.css

aos.css

564 ms

all.css

all.css

558 ms

base.css

base.css

749 ms

css2

css2

33 ms

js

js

68 ms

system.css

system.css

691 ms

jquery-2.2.3.min.js

jquery-2.2.3.min.js

908 ms

bootstrap.min.js

bootstrap.min.js

702 ms

pagetop.js

pagetop.js

742 ms

config.js

config.js

907 ms

tel-3.1.js

tel-3.1.js

908 ms

drawer_menu.js

drawer_menu.js

908 ms

jquery.matchHeight.js

jquery.matchHeight.js

926 ms

aos.js

aos.js

935 ms

ofi.min.js

ofi.min.js

935 ms

logo.png

logo.png

265 ms

main.jpg

main.jpg

1137 ms

h2-xs.png

h2-xs.png

280 ms

h2.png

h2.png

526 ms

bg-books.jpg

bg-books.jpg

537 ms

3298_300x442.jpg

3298_300x442.jpg

914 ms

3281_300x417.jpg

3281_300x417.jpg

1125 ms

3175_300x401.jpg

3175_300x401.jpg

975 ms

3177_300x431.jpg

3177_300x431.jpg

1078 ms

4252_300x460.jpg

4252_300x460.jpg

1279 ms

4251_300x462.jpg

4251_300x462.jpg

1290 ms

3308_300x441.jpg

3308_300x441.jpg

1155 ms

112_300x425.jpg

112_300x425.jpg

1265 ms

214_300x440.jpg

214_300x440.jpg

1301 ms

212_300x438.jpg

212_300x438.jpg

1312 ms

211_300x411.jpg

211_300x411.jpg

1335 ms

193_300x440.jpg

193_300x440.jpg

1456 ms

209_300x425.jpg

209_300x425.jpg

1470 ms

194_300x456.jpg

194_300x456.jpg

1486 ms

210_300x467.jpg

210_300x467.jpg

1645 ms

bg-footer.jpg

bg-footer.jpg

1494 ms

footer-logo.png

footer-logo.png

1509 ms

pagetop.png

pagetop.png

1640 ms

BIZUDPGothic-Regular.ttf

BIZUDPGothic-Regular.ttf

2135 ms

fa-solid-900.woff

fa-solid-900.woff

1542 ms

fa-regular-400.woff

fa-regular-400.woff

1531 ms

wlpigxjLBV1hqnzfr-F8sEYMB0Yybp0mudRf36yPAGEii5w.ttf

wlpigxjLBV1hqnzfr-F8sEYMB0Yybp0mudRf36yPAGEii5w.ttf

82 ms

wlpigxjLBV1hqnzfr-F8sEYMB0Yybp0mudRfi6mPAGEii5w.ttf

wlpigxjLBV1hqnzfr-F8sEYMB0Yybp0mudRfi6mPAGEii5w.ttf

81 ms

BIZUDPGothic-Bold.ttf

BIZUDPGothic-Bold.ttf

2145 ms

Accessibility Review

kaibunsha.co.jp accessibility score

79

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

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

[id] attributes on active, focusable elements are not unique

Best Practices

kaibunsha.co.jp best practices score

67

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

Page has valid source maps

SEO Factors

kaibunsha.co.jp SEO score

98

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

    JA

  • Language Claimed

    JA

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Kaibunsha.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 Kaibunsha.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

kaibunsha.co.jp

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