Report Summary

  • 32

    Performance

    Renders faster than
    52% of other websites

  • 69

    Accessibility

    Visual factors better than
    that of 35% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

ddr-navi.jp

TOPページ | DDR-Navi

Page Load Speed

2.3 sec in total

First Response

585 ms

Resources Loaded

1.6 sec

Page Rendered

172 ms

ddr-navi.jp screenshot

About Website

Visit ddr-navi.jp now to see the best up-to-date DDR Navi content for Japan and also check out these interesting facts you probably never knew about ddr-navi.jp

DanceDanceRevolution -DDR- が設置されているゲームセンターの情報を掲載しています

Visit ddr-navi.jp

Key Findings

We analyzed Ddr-navi.jp page load time and found that the first response time was 585 ms and then it took 1.7 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.

Performance Metrics

ddr-navi.jp performance score

32

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.4 s

6/100

10%

LCP (Largest Contentful Paint)

Value6.3 s

10/100

25%

SI (Speed Index)

Value9.8 s

10/100

10%

TBT (Total Blocking Time)

Value760 ms

39/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value12.5 s

14/100

10%

Network Requests Diagram

ddr-navi.jp

585 ms

menu.htm

601 ms

main.htm

351 ms

main2.htm

371 ms

style.css

332 ms

Our browser made a total of 16 requests to load all elements on the main page. We found that 56% of them (9 requests) were addressed to the original Ddr-navi.jp, 19% (3 requests) were made to Google-analytics.com and 13% (2 requests) were made to Platform.twitter.com. The less responsive or slowest element that took the longest time to load (614 ms) belongs to the original domain Ddr-navi.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 2.3 kB (5%)

Content Size

47.4 kB

After Optimization

45.1 kB

In fact, the total size of Ddr-navi.jp main page is 47.4 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. 20% of websites need less resources to load. Images take 27.5 kB which makes up the majority of the site volume.

HTML Optimization

-52%

Potential reduce by 1.1 kB

  • Original 2.2 kB
  • After minification 2.1 kB
  • After compression 1.0 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 1.1 kB or 52% of the original size.

Image Optimization

-3%

Potential reduce by 781 B

  • Original 27.5 kB
  • After minification 26.7 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. DDR Navi images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 34 B

  • Original 17.2 kB
  • After minification 17.2 kB
  • After compression 17.1 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. This website has mostly compressed JavaScripts.

CSS Optimization

-63%

Potential reduce by 358 B

  • Original 568 B
  • After minification 502 B
  • After compression 210 B

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. Ddr-navi.jp needs all CSS files to be minified and compressed as it can save up to 358 B or 63% of the original size.

Requests Breakdown

Number of requests can be reduced by 3 (20%)

Requests Now

15

After Optimization

12

The browser has sent 15 CSS, Javascripts, AJAX and image requests in order to completely render the main page of DDR Navi. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and as a result speed up the page load time.

Accessibility Review

ddr-navi.jp accessibility score

69

Accessibility Issues

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

High

[aria-*] attributes do not match their roles

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

Buttons do not have an accessible name

High

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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.

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

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

Best Practices

ddr-navi.jp best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

ddr-navi.jp SEO score

75

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Links do not have descriptive text

High

Image elements do not have [alt] attributes

Crawling and Indexing

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

Impact

Issue

High

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

High

Document uses legible font sizes

Language and Encoding

  • Language Detected

    JA

  • Language Claimed

    N/A

  • Encoding

    SHIFT_JIS

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Ddr-navi.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 Ddr-navi.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 DDR Navi. 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: