4.4 sec in total
877 ms
3.4 sec
132 ms
Visit ndl.go.jp now to see the best up-to-date Ndl content for Japan and also check out these interesting facts you probably never knew about ndl.go.jp
国立国会図書館の公式ウェブサイトです。当館は、国内外の資料・情報を広く収集・保存して、知識・文化の基盤となり、国会の活動を補佐するとともに、行政・司法及び国民に図書館サービスを提供しています。
Visit ndl.go.jpWe analyzed Ndl.go.jp page load time and found that the first response time was 877 ms and then it took 3.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.
ndl.go.jp performance score
name
value
score
weighting
Value7.1 s
1/100
10%
Value26.7 s
0/100
25%
Value8.4 s
19/100
10%
Value0 ms
100/100
30%
Value0.533
14/100
15%
Value7.1 s
52/100
10%
877 ms
439 ms
441 ms
34 ms
464 ms
Our browser made a total of 83 requests to load all elements on the main page. We found that 89% of them (74 requests) were addressed to the original Ndl.go.jp, 8% (7 requests) were made to Google.com and 2% (2 requests) were made to Cse.google.com. The less responsive or slowest element that took the longest time to load (1 sec) belongs to the original domain Ndl.go.jp.
Page size can be reduced by 163.2 kB (34%)
487.2 kB
324.0 kB
In fact, the total size of Ndl.go.jp main page is 487.2 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. 40% of websites need less resources to load. Images take 252.0 kB which makes up the majority of the site volume.
Potential reduce by 26.9 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 26.9 kB or 77% of the original size.
Potential reduce by 15.2 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. Ndl images are well optimized though.
Potential reduce by 78.7 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 78.7 kB or 53% of the original size.
Potential reduce by 42.4 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. Ndl.go.jp needs all CSS files to be minified and compressed as it can save up to 42.4 kB or 81% of the original size.
Number of requests can be reduced by 37 (46%)
81
44
The browser has sent 81 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 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 12 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.
ndl.go.jp
877 ms
common.css
439 ms
search.css
441 ms
default.css
34 ms
search.js
464 ms
jsapi
57 ms
re_top.css
470 ms
func.js
592 ms
ndlsearch-inside.js
509 ms
tab_change.js
582 ms
calendar.js
876 ms
calendar_holiday.js
617 ms
calendar_summary.js
622 ms
noscript.css
685 ms
urchin.js
870 ms
default.css
32 ms
logo.jpg
174 ms
menu1-title.jpg
153 ms
menu1-01_off.jpg
162 ms
menu1-02_off.jpg
153 ms
menu1-03_off.jpg
162 ms
menu1-04_off.jpg
200 ms
menu1-05_off.jpg
298 ms
menu1-06_off.jpg
299 ms
menu1-07_off.jpg
316 ms
menu2-title.jpg
316 ms
menu2-01_off.jpg
344 ms
menu2-02_off.jpg
397 ms
menu2-03_off.jpg
443 ms
menu2-04_off.jpg
444 ms
menu2-05_off.jpg
470 ms
menu2-06_off.jpg
471 ms
title_ndl-opac.jpg
516 ms
bt_search-b2_off.gif
592 ms
banner_archive.png
588 ms
banner_kaigiroku.gif
589 ms
banner_ndl_opac.gif
623 ms
banner_digi.gif
624 ms
banner_kindai.gif
686 ms
banner_research.gif
733 ms
banner_reference.gif
734 ms
banner_hourei.gif
787 ms
bnr_kids.jpg
779 ms
banner_ca.gif
778 ms
banner_jikocho.gif
855 ms
ico_rss.gif
880 ms
bt_press_off.gif
879 ms
bt_news_off.gif
933 ms
bt_event_off.gif
933 ms
bt_issue_off.gif
982 ms
bt_recruit_off.gif
1027 ms
ico_etc.gif
1021 ms
16 ms
default+ja.css
6 ms
default+ja.I.js
11 ms
async-ads.js
30 ms
google_custom_search_watermark.gif
20 ms
small-logo.png
20 ms
ico_recruit.gif
881 ms
ico_issue.gif
952 ms
ico_press.gif
954 ms
ico_news.gif
1028 ms
ico_event.gif
1009 ms
spot_reference781.jpg
988 ms
spot_smallexb19.jpg
914 ms
__utm.gif
960 ms
bg_header_l.jpg
953 ms
bg_header.jpg
1011 ms
ico_arrow_c.gif
989 ms
bg_r_search.gif
990 ms
bg_title_top.gif
939 ms
ico_arrow.gif
970 ms
top_title_important2.gif
953 ms
top_title1.gif
1002 ms
ico_point.gif
964 ms
ico_arrow_down.gif
967 ms
top_title2.gif
993 ms
tab_top_on.gif
977 ms
tab_top_off.gif
954 ms
footer_bg.gif
994 ms
ico_home.gif
938 ms
copyright_bg.gif
991 ms
re_print.css
174 ms
ndl.go.jp accessibility score
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
Impact
Issue
ARIA input fields do not have accessible names
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
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
Links do not have a discernible name
Tables and lists
These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Impact
Issue
Lists do not contain only <li> elements and script supporting elements (<script> and <template>).
ndl.go.jp best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
ndl.go.jp SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
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
Document uses legible font sizes
Tap targets are not sized appropriately
JA
JA
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Ndl.go.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 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.
ndl.go.jp
Open Graph description is not detected on the main page of 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: