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j-wave.co.jp screenshot

Report Summary

  • 18

    Performance

    Renders faster than
    34% of other websites

  • 85

    Accessibility

    Visual factors better than
    that of 58% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

j-wave.co.jp

J-WAVE 81.3 FM RADIO

Page Load Speed

7.8 sec in total

First Response

504 ms

Resources Loaded

7 sec

Page Rendered

294 ms

j-wave.co.jp screenshot

About Website

Welcome to j-wave.co.jp homepage info - get ready to check J WAVE best content for Japan right away, or after learning these important things about j-wave.co.jp

FMラジオ局 J-WAVE 周波数は81.3MHz(東京スカイツリー)、88.3MHz(六本木中継局)。オンエアした楽曲の検索や放送内容、ポッドキャストなど情報満載！radiko(ラジコ)でもラジオがお楽しみいただけます。

Visit j-wave.co.jp

Key Findings

We analyzed J-wave.co.jp page load time and found that the first response time was 504 ms and then it took 7.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.

Performance Metrics

j-wave.co.jp performance score

18

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.2 s

19/100

10%

LCP (Largest Contentful Paint)

Value18.2 s

0/100

25%

SI (Speed Index)

Value12.6 s

3/100

10%

TBT (Total Blocking Time)

Value2,900 ms

3/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value18.2 s

3/100

10%

Network Requests Diagram

j-wave.co.jp

504 ms

www.j-wave.co.jp

1320 ms

gigya_dialog.css

902 ms

gigya_button_custom.css

892 ms

common.css

974 ms

Our browser made a total of 61 requests to load all elements on the main page. We found that 54% of them (33 requests) were addressed to the original J-wave.co.jp, 5% (3 requests) were made to Googletagmanager.com and 5% (3 requests) were made to Site-search.movabletype.net. The less responsive or slowest element that took the longest time to load (2.5 sec) belongs to the original domain J-wave.co.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 132.4 kB (22%)

Content Size

599.5 kB

After Optimization

467.1 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of J-wave.co.jp main page is 599.5 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. 55% of websites need less resources to load. Javascripts take 380.2 kB which makes up the majority of the site volume.

HTML Optimization

-70%

Potential reduce by 104.1 kB

  • Original 147.7 kB
  • After minification 135.3 kB
  • After compression 43.6 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 104.1 kB or 70% of the original size.

Image Optimization

-26%

Potential reduce by 4.5 kB

  • Original 17.3 kB
  • After minification 12.7 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. Obviously, J WAVE needs image optimization as it can save up to 4.5 kB or 26% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-3%

Potential reduce by 12.3 kB

  • Original 380.2 kB
  • After minification 380.2 kB
  • After compression 367.9 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

-21%

Potential reduce by 11.4 kB

  • Original 54.3 kB
  • After minification 54.3 kB
  • After compression 42.9 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. J-wave.co.jp needs all CSS files to be minified and compressed as it can save up to 11.4 kB or 21% of the original size.

Requests Breakdown

Number of requests can be reduced by 33 (59%)

Requests Now

56

After Optimization

23

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 56 CSS, Javascripts, AJAX and image requests in order to completely render the main page of J WAVE. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 27 to 1 for JavaScripts and from 8 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

j-wave.co.jp

j-wave.co.jp

504 ms

www.j-wave.co.jp

www.j-wave.co.jp

1320 ms

gigya_dialog.css

gigya_dialog.css

902 ms

gigya_button_custom.css

gigya_button_custom.css

892 ms

common.css

common.css

974 ms

css

css

38 ms

style.css

style.css

985 ms

update2022.css

update2022.css

1109 ms

pushcode.js

pushcode.js

886 ms

index.esm.js

index.esm.js

375 ms

search.js

search.js

45 ms

adsbygoogle.js

adsbygoogle.js

117 ms

jquery-3.4.1.min.js

jquery-3.4.1.min.js

1404 ms

gigya_v2021.js

gigya_v2021.js

1839 ms

point.js

point.js

2195 ms

addClip.js

addClip.js

1332 ms

main-min.js

main-min.js

1936 ms

jtop.js

jtop.js

2097 ms

gigya.edit.userinfo_v2.js

gigya.edit.userinfo_v2.js

1548 ms

sprintf.min.js

sprintf.min.js

32 ms

js.cookie.min.js

js.cookie.min.js

50 ms

polyfill.js

polyfill.js

1578 ms

myjwave.js

myjwave.js

2206 ms

ekster.css

ekster.css

1464 ms

2fe11d27-d188-426f-8237-af0565a85379

2fe11d27-d188-426f-8237-af0565a85379

337 ms

gtm.js

gtm.js

353 ms

ttl_jwave.svg

ttl_jwave.svg

412 ms

icon_line.svg

icon_line.svg

1013 ms

symbol-defs.svg

symbol-defs.svg

344 ms

logo_myjwave.svg

logo_myjwave.svg

1012 ms

img_nowonair_default.jpg

img_nowonair_default.jpg

404 ms

ttl_keyword.svg

ttl_keyword.svg

1278 ms

ttl_news.svg

ttl_news.svg

1236 ms

ttl_myjwave.svg

ttl_myjwave.svg

1261 ms

ttl_spinear.png

ttl_spinear.png

1248 ms

logo_tokyohot.svg

logo_tokyohot.svg

1294 ms

ttl_jwave.svg

ttl_jwave.svg

1291 ms

icon_line.svg

icon_line.svg

2225 ms

logo_myjwave.svg

logo_myjwave.svg

1968 ms

logo_jwavenews.svg

logo_jwavenews.svg

1618 ms

font

font

279 ms

Ekster-Bold.woff

Ekster-Bold.woff

2498 ms

Ekster-Regular.woff

Ekster-Regular.woff

2419 ms

font

font

278 ms

analytics.js

analytics.js

80 ms

get_cookie_id

get_cookie_id

530 ms

fwn.js

fwn.js

588 ms

destination

destination

114 ms

js

js

336 ms

btn_spinear.png

btn_spinear.png

1966 ms

collect

collect

305 ms

whatwg-fetch.bundle.js

whatwg-fetch.bundle.js

256 ms

collect

collect

158 ms

tr.js

tr.js

147 ms

search.css

search.css

47 ms

web_access_log

web_access_log

43 ms

ga-audiences

ga-audiences

106 ms

global_id

global_id

5 ms

log

log

678 ms

bi.js

bi.js

1037 ms

fbevents.js

fbevents.js

15 ms

Accessibility Review

j-wave.co.jp accessibility score

85

Accessibility Issues

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

[id] attributes on active, focusable elements are not unique

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 IDs are not unique

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

Links do not have a discernible name

Best Practices

j-wave.co.jp best practices score

75

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

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

j-wave.co.jp SEO score

93

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

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

    JA

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise J-wave.co.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 J-wave.co.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

j-wave.co.jp

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