Report Summary

  • 37

    Performance

    Renders faster than
    57% of other websites

  • 86

    Accessibility

    Visual factors better than
    that of 62% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 100

    SEO

    Google-friendlier than
    95% of websites

ebook.itmedia.co.jp

電子書籍 - ITmedia Mobile

Page Load Speed

5.2 sec in total

First Response

303 ms

Resources Loaded

4.5 sec

Page Rendered

415 ms

ebook.itmedia.co.jp screenshot

About Website

Visit ebook.itmedia.co.jp now to see the best up-to-date Ebook ITmedia content for Japan and also check out these interesting facts you probably never knew about ebook.itmedia.co.jp

電子書籍/電子出版の今を知る、今が分かる

Visit ebook.itmedia.co.jp

Key Findings

We analyzed Ebook.itmedia.co.jp page load time and found that the first response time was 303 ms and then it took 4.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

ebook.itmedia.co.jp performance score

37

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.5 s

2/100

10%

LCP (Largest Contentful Paint)

Value10.3 s

0/100

25%

SI (Speed Index)

Value9.3 s

12/100

10%

TBT (Total Blocking Time)

Value410 ms

66/100

30%

CLS (Cumulative Layout Shift)

Value0.02

100/100

15%

TTI (Time to Interactive)

Value15.2 s

7/100

10%

Network Requests Diagram

ebook.itmedia.co.jp

303 ms

306 ms

movePC2SP.js

149 ms

base.css

294 ms

ad.css

297 ms

Our browser made a total of 149 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Ebook.itmedia.co.jp, 27% (40 requests) were made to Image.itmedia.co.jp and 16% (24 requests) were made to Itmedia.co.jp. The less responsive or slowest element that took the longest time to load (897 ms) relates to the external source Image.itmedia.co.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 474.0 kB (54%)

Content Size

871.3 kB

After Optimization

397.3 kB

In fact, the total size of Ebook.itmedia.co.jp main page is 871.3 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 65% of websites need less resources to load. Javascripts take 444.7 kB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 95.0 kB

  • Original 117.1 kB
  • After minification 114.5 kB
  • After compression 22.1 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 95.0 kB or 81% of the original size.

Image Optimization

-5%

Potential reduce by 11.8 kB

  • Original 221.9 kB
  • After minification 210.1 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. Ebook ITmedia images are well optimized though.

JavaScript Optimization

-67%

Potential reduce by 299.7 kB

  • Original 444.7 kB
  • After minification 369.4 kB
  • After compression 145.0 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 299.7 kB or 67% of the original size.

CSS Optimization

-77%

Potential reduce by 67.5 kB

  • Original 87.7 kB
  • After minification 70.4 kB
  • After compression 20.2 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. Ebook.itmedia.co.jp needs all CSS files to be minified and compressed as it can save up to 67.5 kB or 77% of the original size.

Requests Breakdown

Number of requests can be reduced by 77 (53%)

Requests Now

146

After Optimization

69

The browser has sent 146 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Ebook ITmedia. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 54 to 1 for JavaScripts and from 8 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

ebook.itmedia.co.jp accessibility score

86

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

ebook.itmedia.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

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

ebook.itmedia.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

    SHIFT_JIS

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Ebook.itmedia.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 Ebook.itmedia.co.jp main page’s claimed encoding is shift_jis. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

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