Tools & Wizards About Us

Report Summary

  • 8

    Performance

    Renders faster than
    22% of other websites

  • 64

    Accessibility

    Visual factors better than
    that of 29% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 79

    SEO

    Google-friendlier than
    40% of websites

denon.jp

Denon - デノン製品公式サイト

Page Load Speed

21.4 sec in total

First Response

44 ms

Resources Loaded

21.1 sec

Page Rendered

294 ms

About Website

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

【Denon公式製品サイト】Denonは1910年創業のオーディオブランドです。高品質を追求したAVアンプ、スピーカー、ヘッドホン等のオーディオ製品のご紹介や、その他製品カタログのご請求、修理のご依頼なども承っております。

Visit denon.jp

Key Findings

We analyzed Denon.jp page load time and found that the first response time was 44 ms and then it took 21.4 sec to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster. Unfortunately, there was 1 request timeout, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

denon.jp performance score

8

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.0 s

49/100

10%

LCP (Largest Contentful Paint)

Value8.1 s

2/100

25%

SI (Speed Index)

Value12.8 s

2/100

10%

TBT (Total Blocking Time)

Value2,020 ms

7/100

30%

CLS (Cumulative Layout Shift)

Value0.883

3/100

15%

TTI (Time to Interactive)

Value20.0 s

2/100

10%

Network Requests Diagram

denon.jp

44 ms

www.denon.jp

81 ms

ja-jp

287 ms

gtm.js

97 ms

jquery.min.js

51 ms

Our browser made a total of 320 requests to load all elements on the main page. We found that 74% of them (238 requests) were addressed to the original Denon.jp, 12% (37 requests) were made to S.amazon-adsystem.com and 2% (5 requests) were made to Cm.g.doubleclick.net. The less responsive or slowest element that took the longest time to load (19.8 sec) relates to the external source Public-prod-dspcookiematching.dmxleo.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 157.0 kB (6%)

Content Size

2.8 MB

After Optimization

2.6 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Denon.jp main page is 2.8 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. Only a small number of websites need less resources to load. Images take 1.6 MB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 122.6 kB

  • Original 150.1 kB
  • After minification 150.0 kB
  • After compression 27.5 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 122.6 kB or 82% of the original size.

Image Optimization

-0%

Potential reduce by 5 B

  • Original 1.6 MB
  • After minification 1.6 MB

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. Denon images are well optimized though.

JavaScript Optimization

-4%

Potential reduce by 34.4 kB

  • Original 925.0 kB
  • After minification 924.9 kB
  • After compression 890.6 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

-0%

Potential reduce by 36 B

  • Original 79.3 kB
  • After minification 79.3 kB
  • After compression 79.2 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. Denon.jp has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 256 (86%)

Requests Now

299

After Optimization

43

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 299 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Denon. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 203 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

denon.jp accessibility score

64

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

[role] values are not valid

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

denon.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

High

Page has valid source maps

SEO Factors

denon.jp SEO score

79

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 Denon.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 Denon.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

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