Tools & Wizards About Us
rk-japan.co.jp screenshot

Report Summary

  • 26

    Performance

    Renders faster than
    45% of other websites

  • 72

    Accessibility

    Visual factors better than
    that of 37% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 83

    SEO

    Google-friendlier than
    46% of websites

rk-japan.co.jp

アールケー・ジャパン株式会社

Page Load Speed

19 sec in total

First Response

4.5 sec

Resources Loaded

14.4 sec

Page Rendered

108 ms

rk-japan.co.jp screenshot

About Website

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

アールケー・ジャパンウェブサイトのトップページです。

Visit rk-japan.co.jp

Key Findings

We analyzed Rk-japan.co.jp page load time and found that the first response time was 4.5 sec and then it took 14.5 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

rk-japan.co.jp performance score

26

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value10.2 s

0/100

10%

LCP (Largest Contentful Paint)

Value17.3 s

0/100

25%

SI (Speed Index)

Value27.8 s

0/100

10%

TBT (Total Blocking Time)

Value690 ms

43/100

30%

CLS (Cumulative Layout Shift)

Value0.112

87/100

15%

TTI (Time to Interactive)

Value17.9 s

3/100

10%

Network Requests Diagram

rk-japan.co.jp

4472 ms

www.rk-japan.co.jp

3939 ms

MathJax.js

87 ms

style.min.css

860 ms

styles.css

433 ms

Our browser made a total of 52 requests to load all elements on the main page. We found that 71% of them (37 requests) were addressed to the original Rk-japan.co.jp, 6% (3 requests) were made to Unpkg.com and 4% (2 requests) were made to Cdnjs.cloudflare.com. The less responsive or slowest element that took the longest time to load (4.6 sec) belongs to the original domain Rk-japan.co.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 391.4 kB (28%)

Content Size

1.4 MB

After Optimization

1.0 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Rk-japan.co.jp main page is 1.4 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 707.0 kB which makes up the majority of the site volume.

HTML Optimization

-75%

Potential reduce by 42.4 kB

  • Original 56.2 kB
  • After minification 54.1 kB
  • After compression 13.8 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 42.4 kB or 75% of the original size.

Image Optimization

-2%

Potential reduce by 10.8 kB

  • Original 707.0 kB
  • After minification 696.2 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. Rk Japan images are well optimized though.

JavaScript Optimization

-32%

Potential reduce by 131.7 kB

  • Original 409.2 kB
  • After minification 396.5 kB
  • After compression 277.4 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 131.7 kB or 32% of the original size.

CSS Optimization

-83%

Potential reduce by 206.5 kB

  • Original 247.4 kB
  • After minification 226.1 kB
  • After compression 40.9 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. Rk-japan.co.jp needs all CSS files to be minified and compressed as it can save up to 206.5 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 33 (70%)

Requests Now

47

After Optimization

14

  • Images
  • JavaScript
  • CSS

The browser has sent 47 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Rk Japan. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 22 to 1 for JavaScripts and from 13 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

rk-japan.co.jp

rk-japan.co.jp

4472 ms

www.rk-japan.co.jp

www.rk-japan.co.jp

3939 ms

MathJax.js

MathJax.js

87 ms

style.min.css

style.min.css

860 ms

styles.css

styles.css

433 ms

leaflet.css

leaflet.css

14 ms

mappress.css

mappress.css

652 ms

tablepress-combined.min.css

tablepress-combined.min.css

655 ms

jquery.fancybox.min.css

jquery.fancybox.min.css

440 ms

jetpack.css

jetpack.css

988 ms

jquery.js

jquery.js

1299 ms

style_bizvektor_sns.css

style_bizvektor_sns.css

661 ms

css

css

21 ms

bizvektor_common_min.css

bizvektor_common_min.css

868 ms

plain.css

plain.css

1088 ms

www.rk-japan.co.jp

www.rk-japan.co.jp

4559 ms

blank.css

blank.css

1073 ms

leaflet.css

leaflet.css

37 ms

js

js

94 ms

leaflet.css

leaflet.css

27 ms

MathJax.js

MathJax.js

41 ms

wp-emoji-release.min.js

wp-emoji-release.min.js

973 ms

TeX-AMS-MML_HTMLorMML.js

TeX-AMS-MML_HTMLorMML.js

12 ms

comment-reply.min.js

comment-reply.min.js

991 ms

photon.min.js

photon.min.js

1073 ms

scripts.js

scripts.js

1112 ms

api.js

api.js

46 ms

script.js

script.js

1112 ms

jquery.fancybox.min.js

jquery.fancybox.min.js

1209 ms

jquery.easing.min.js

jquery.easing.min.js

1287 ms

jquery.mousewheel.min.js

jquery.mousewheel.min.js

1299 ms

wp-embed.min.js

wp-embed.min.js

1305 ms

jquery.selection.js

jquery.selection.js

1307 ms

style.js

style.js

1427 ms

biz-vektor-min.js

biz-vektor-min.js

1502 ms

e-202433.js

e-202433.js

12 ms

KEEP38_RK_Rev.1.5_ec.png

KEEP38_RK_Rev.1.5_ec.png

116 ms

RK_TAKASAGO_header_jp.png

RK_TAKASAGO_header_jp.png

439 ms

Web_Top_chain.png

Web_Top_chain.png

1773 ms

Top_Category_Banner_01.png

Top_Category_Banner_01.png

867 ms

Top_Category_Banner_02.png

Top_Category_Banner_02.png

859 ms

icon_try1_gray.gif

icon_try1_gray.gif

218 ms

bnr_contact_ja.png

bnr_contact_ja.png

222 ms

footer_pagetop.png

footer_pagetop.png

437 ms

RK_takasago_footer.png

RK_takasago_footer.png

440 ms

FB-icon_30x30.png

FB-icon_30x30.png

654 ms

JCA_logo_footer.png

JCA_logo_footer.png

656 ms

icon_arrow1_gray.gif

icon_arrow1_gray.gif

656 ms

all.js

all.js

29 ms

recaptcha__en.js

recaptcha__en.js

59 ms

S6u9w4BMUTPHh50XSwiPHA.ttf

S6u9w4BMUTPHh50XSwiPHA.ttf

8 ms

all.js

all.js

7 ms

Accessibility Review

rk-japan.co.jp accessibility score

72

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

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

Form elements do not have associated labels

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

rk-japan.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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

rk-japan.co.jp SEO score

83

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

High

Links are not crawlable

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

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 Rk-japan.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 Rk-japan.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

rk-japan.co.jp

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