Report Summary

  • 22

    Performance

    Renders faster than
    41% of other websites

  • 95

    Accessibility

    Visual factors better than
    that of 87% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 100

    SEO

    Google-friendlier than
    95% of websites

dainippon-tosho.co.jp

大日本図書|教科書・デジタル教科書および児童書・一般書の発行

Page Load Speed

12.1 sec in total

First Response

1.5 sec

Resources Loaded

10.2 sec

Page Rendered

277 ms

dainippon-tosho.co.jp screenshot

About Website

Welcome to dainippon-tosho.co.jp homepage info - get ready to check Dainippon Tosho best content for Japan right away, or after learning these important things about dainippon-tosho.co.jp

1890年創業の出版社です。小学校・中学校・高等専門学校向け教科書,児童書,教育書などを発行しています。

Visit dainippon-tosho.co.jp

Key Findings

We analyzed Dainippon-tosho.co.jp page load time and found that the first response time was 1.5 sec and then it took 10.5 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

dainippon-tosho.co.jp performance score

22

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.4 s

2/100

10%

LCP (Largest Contentful Paint)

Value12.3 s

0/100

25%

SI (Speed Index)

Value12.4 s

3/100

10%

TBT (Total Blocking Time)

Value500 ms

58/100

30%

CLS (Cumulative Layout Shift)

Value0.621

10/100

15%

TTI (Time to Interactive)

Value10.0 s

26/100

10%

Network Requests Diagram

dainippon-tosho.co.jp

1544 ms

styles.css

489 ms

jquery.js

2587 ms

script.js

870 ms

jquery.mousewheel.js

527 ms

Our browser made a total of 153 requests to load all elements on the main page. We found that all of those requests were addressed to Dainippon-tosho.co.jp and no external sources were called. The less responsive or slowest element that took the longest time to load (6.2 sec) belongs to the original domain Dainippon-tosho.co.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 303.6 kB (20%)

Content Size

1.5 MB

After Optimization

1.2 MB

In fact, the total size of Dainippon-tosho.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. 30% of websites need less resources to load. Images take 1.2 MB which makes up the majority of the site volume.

HTML Optimization

-87%

Potential reduce by 48.5 kB

  • Original 55.5 kB
  • After minification 50.8 kB
  • After compression 7.0 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. 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 48.5 kB or 87% of the original size.

Image Optimization

-4%

Potential reduce by 44.5 kB

  • Original 1.2 MB
  • After minification 1.1 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. Dainippon Tosho images are well optimized though.

JavaScript Optimization

-75%

Potential reduce by 162.8 kB

  • Original 218.3 kB
  • After minification 172.4 kB
  • After compression 55.4 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 162.8 kB or 75% of the original size.

CSS Optimization

-83%

Potential reduce by 47.7 kB

  • Original 57.8 kB
  • After minification 50.3 kB
  • After compression 10.1 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. Dainippon-tosho.co.jp needs all CSS files to be minified and compressed as it can save up to 47.7 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 27 (18%)

Requests Now

152

After Optimization

125

The browser has sent 152 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dainippon Tosho. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

dainippon-tosho.co.jp accessibility score

95

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

Links do not have a discernible name

Best Practices

dainippon-tosho.co.jp best practices score

83

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

SEO Factors

dainippon-tosho.co.jp SEO score

100

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

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 Dainippon-tosho.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 Dainippon-tosho.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

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