Tools & Wizards About Us
rnavi.ndl.go.jp screenshot

Report Summary

  • 59

    Performance

    Renders faster than
    75% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 89% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

rnavi.ndl.go.jp

リサーチ・ナビ | 国立国会図書館

Page Load Speed

6 sec in total

First Response

485 ms

Resources Loaded

5.4 sec

Page Rendered

174 ms

rnavi.ndl.go.jp screenshot

About Website

Visit rnavi.ndl.go.jp now to see the best up-to-date Rnavi Ndl content for Japan and also check out these interesting facts you probably never knew about rnavi.ndl.go.jp

調査のポイントや参考資料、専門室の情報、便利なデータベースの紹介、使えるWebサイトの案内など、調べものに役立つ情報を提供しています。

Visit rnavi.ndl.go.jp

Key Findings

We analyzed Rnavi.ndl.go.jp page load time and found that the first response time was 485 ms and then it took 5.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

rnavi.ndl.go.jp performance score

59

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.1 s

8/100

10%

LCP (Largest Contentful Paint)

Value5.3 s

21/100

25%

SI (Speed Index)

Value6.6 s

38/100

10%

TBT (Total Blocking Time)

Value10 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.139

79/100

15%

TTI (Time to Interactive)

Value5.2 s

74/100

10%

Network Requests Diagram

rnavi.ndl.go.jp

485 ms

782 ms

styles.css

329 ms

mt.js

778 ms

showhide.js

370 ms

Our browser made a total of 40 requests to load all elements on the main page. We found that all of those requests were addressed to Rnavi.ndl.go.jp and no external sources were called. The less responsive or slowest element that took the longest time to load (2.3 sec) belongs to the original domain Rnavi.ndl.go.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 64.1 kB (37%)

Content Size

174.7 kB

After Optimization

110.6 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Rnavi.ndl.go.jp main page is 174.7 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. Only 10% of websites need less resources to load. Images take 104.1 kB which makes up the majority of the site volume.

HTML Optimization

-66%

Potential reduce by 6.4 kB

  • Original 9.8 kB
  • After minification 9.3 kB
  • After compression 3.4 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. 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 6.4 kB or 66% of the original size.

Image Optimization

-9%

Potential reduce by 8.9 kB

  • Original 104.1 kB
  • After minification 95.2 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. Rnavi Ndl images are well optimized though.

JavaScript Optimization

-79%

Potential reduce by 16.1 kB

  • Original 20.5 kB
  • After minification 13.5 kB
  • After compression 4.4 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 16.1 kB or 79% of the original size.

CSS Optimization

-81%

Potential reduce by 32.6 kB

  • Original 40.3 kB
  • After minification 27.3 kB
  • After compression 7.7 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. Rnavi.ndl.go.jp needs all CSS files to be minified and compressed as it can save up to 32.6 kB or 81% of the original size.

Requests Breakdown

Number of requests can be reduced by 13 (35%)

Requests Now

37

After Optimization

24

  • Images
  • JavaScript
  • CSS

The browser has sent 37 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Rnavi Ndl. 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 CSS and as a result speed up the page load time.

Network Requests Diagram

rnavi.ndl.go.jp

rnavi.ndl.go.jp

485 ms

782 ms

styles.css

styles.css

329 ms

mt.js

mt.js

778 ms

showhide.js

showhide.js

370 ms

menufolder.js

menufolder.js

345 ms

blog.css

blog.css

841 ms

screen.css

screen.css

706 ms

bg_header_line.jpg

bg_header_line.jpg

341 ms

bnr_logo_l.gif

bnr_logo_l.gif

367 ms

bt_search.png

bt_search.png

417 ms

hatena.JPG

hatena.JPG

409 ms

bnr_logo_text.gif

bnr_logo_text.gif

429 ms

ct_search.png

ct_search.png

817 ms

ct_ndlsearch.png

ct_ndlsearch.png

1077 ms

ct_booksearch.png

ct_booksearch.png

858 ms

ct_hint.png

ct_hint.png

1046 ms

ct_field.png

ct_field.png

770 ms

ico_whatsnew.png

ico_whatsnew.png

787 ms

ct_tools.png

ct_tools.png

1400 ms

bt_researchnavi.png

bt_researchnavi.png

1201 ms

bt_tips.png

bt_tips.png

1229 ms

bt_comming.png

bt_comming.png

1263 ms

bt_hear.png

bt_hear.png

1423 ms

bn_ndl_hp.gif

bn_ndl_hp.gif

1560 ms

logo_opac_s.PNG

logo_opac_s.PNG

1876 ms

logo_ndl_search.jpg

logo_ndl_search.jpg

1581 ms

banner_digi.png

banner_digi.png

1776 ms

banner_jp_nom.png

banner_jp_nom.png

1946 ms

crd_bns2.gif

crd_bns2.gif

2007 ms

logo_kaleido.gif

logo_kaleido.gif

2025 ms

bg_content_header.jpg

bg_content_header.jpg

1937 ms

bg_midashi.png

bg_midashi.png

2090 ms

bg_topmenu.png

bg_topmenu.png

2221 ms

ic_arrow_blue.png

ic_arrow_blue.png

2290 ms

ic_arrow_blue.png

ic_arrow_blue.png

2289 ms

bg_footer_line.jpg

bg_footer_line.jpg

2319 ms

print.css

print.css

177 ms

blog_print.css

blog_print.css

547 ms

screen_print.css

screen_print.css

594 ms

Accessibility Review

rnavi.ndl.go.jp accessibility score

96

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

rnavi.ndl.go.jp best practices score

67

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

Displays images with incorrect aspect ratio

High

Serves images with low resolution

SEO Factors

rnavi.ndl.go.jp SEO score

75

Search Engine Optimization Advices

Language and Encoding

  • Language Detected

    JA

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Rnavi.ndl.go.jp can be misinterpreted by Google and other search engines. Our service has detected that Japanese is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Rnavi.ndl.go.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

rnavi.ndl.go.jp

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