5.8 sec in total
1 sec
4.2 sec
530 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 1 sec and then it took 4.7 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.
ndl.go.jp performance score
name
value
score
weighting
Value6.0 s
4/100
10%
Value17.4 s
0/100
25%
Value7.9 s
22/100
10%
Value170 ms
93/100
30%
Value0.542
13/100
15%
Value6.2 s
62/100
10%
1035 ms
337 ms
506 ms
1013 ms
510 ms
Our browser made a total of 51 requests to load all elements on the main page. We found that 96% of them (49 requests) were addressed to the original Ndl.go.jp, 2% (1 request) were made to Google.com and 2% (1 request) were made to Gstatic.com. The less responsive or slowest element that took the longest time to load (1.6 sec) belongs to the original domain Ndl.go.jp.
Page size can be reduced by 461.7 kB (16%)
2.9 MB
2.4 MB
In fact, the total size of Ndl.go.jp main page is 2.9 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. 35% of websites need less resources to load. Images take 2.5 MB which makes up the majority of the site volume.
Potential reduce by 60.4 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. This page needs HTML code to be minified as it can gain 10.6 kB, which is 14% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 60.4 kB or 83% of the original size.
Potential reduce by 144.6 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 130.0 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 130.0 kB or 65% of the original size.
Potential reduce by 126.7 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. Ndl.go.jp needs all CSS files to be minified and compressed as it can save up to 126.7 kB or 87% of the original size.
Number of requests can be reduced by 17 (35%)
49
32
The browser has sent 49 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 6 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.
www.ndl.go.jp
1035 ms
sanitize.css
337 ms
slick.css
506 ms
style.css
1013 ms
noscript.css
510 ms
search.js
513 ms
jsapi
18 ms
jquery.js
943 ms
ndlsearch-inside.js
580 ms
slick.min.js
675 ms
index.js
847 ms
loader.js
22 ms
logo.png
340 ms
arrow_right_blue.png
217 ms
ndl_online.png
223 ms
search_w.png
224 ms
slider_02_2.png
344 ms
landmarks_jpn.jpg
1191 ms
warpslide.jpg
1361 ms
NDLA_slide_jp.jpg
366 ms
icon_rss.png
389 ms
banner_kaigiroku.png
676 ms
banner_digi.gif
513 ms
banner_warp.jpg
546 ms
rn_banner.png
581 ms
banner_hourei.png
683 ms
banner_crd.png
726 ms
banner_archive.png
775 ms
banner_ca.png
845 ms
banner_d_exhibitions.png
852 ms
bnr_kids.png
906 ms
banner_ilcl.png
968 ms
banner_jikocho.gif
1014 ms
banner_JapanSearch.png
1020 ms
g_navi.html
947 ms
footernavi.html
1021 ms
bg_top.jpg
1645 ms
icon_stop.png
976 ms
icon_mail_maga.png
1056 ms
icon_api.png
1143 ms
icon_x.png
1146 ms
icon_facebook.png
1145 ms
icon_youtube.png
1236 ms
icon_instagram.png
1337 ms
arrow_left_w.png
1315 ms
arrow_right_w.png
1315 ms
icon_calendar.png
1316 ms
icon_access.png
1416 ms
arrow_down_blue.png
1483 ms
home.png
601 ms
arrow_down_w.png
603 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-hidden="true"] elements contain focusable descendents
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: