Tools & Wizards About Us

Report Summary

  • 25

    Performance

    Renders faster than
    44% of other websites

  • 89

    Accessibility

    Visual factors better than
    that of 71% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 100

    SEO

    Google-friendlier than
    94% of websites

jabble.jp

英会話教室ならジャブル｜質の高い英語が学べる語学スクール

Page Load Speed

10.7 sec in total

First Response

695 ms

Resources Loaded

8.3 sec

Page Rendered

1.8 sec

About Website

Click here to check amazing Jabble content. Otherwise, check out these important facts you probably never knew about jabble.jp

ネイティブ講師と会話中心のレッスンで室の高い英語が学べる英会話スクール・ジャブル Jabble。グループ・マンツーマンでの対面レッスンはもちろん、オンラインレッスンも。ターミナル駅（お茶の水・武蔵小杉・船橋・千葉）から徒歩４分圏内のアクセスのよさも通いやすい英会話教室です。

Visit jabble.jp

Key Findings

We analyzed Jabble.jp page load time and found that the first response time was 695 ms and then it took 10 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.

Performance Metrics

jabble.jp performance score

25

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value8.7 s

0/100

10%

LCP (Largest Contentful Paint)

Value51.8 s

0/100

25%

SI (Speed Index)

Value15.3 s

1/100

10%

TBT (Total Blocking Time)

Value850 ms

34/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value23.7 s

1/100

10%

Network Requests Diagram

jabble.jp

695 ms

jabble.jp

3273 ms

js

74 ms

gtm.js

121 ms

style.min.css

189 ms

Our browser made a total of 94 requests to load all elements on the main page. We found that 82% of them (77 requests) were addressed to the original Jabble.jp, 15% (14 requests) were made to Fonts.gstatic.com and 2% (2 requests) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (3.3 sec) belongs to the original domain Jabble.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 918.2 kB (6%)

Content Size

15.0 MB

After Optimization

14.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Jabble.jp main page is 15.0 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 14.8 MB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 60.2 kB

  • Original 72.3 kB
  • After minification 63.7 kB
  • After compression 12.1 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 8.6 kB, which is 12% 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 60.2 kB or 83% of the original size.

Image Optimization

-6%

Potential reduce by 813.3 kB

  • Original 14.8 MB
  • After minification 13.9 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. Jabble images are well optimized though.

JavaScript Optimization

-23%

Potential reduce by 15.9 kB

  • Original 68.2 kB
  • After minification 68.2 kB
  • After compression 52.3 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 15.9 kB or 23% of the original size.

CSS Optimization

-35%

Potential reduce by 28.8 kB

  • Original 81.8 kB
  • After minification 81.8 kB
  • After compression 53.0 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. Jabble.jp needs all CSS files to be minified and compressed as it can save up to 28.8 kB or 35% of the original size.

Requests Breakdown

Number of requests can be reduced by 26 (33%)

Requests Now

78

After Optimization

52

  • Images
  • JavaScript
  • CSS

The browser has sent 78 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Jabble. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and from 12 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

jabble.jp accessibility score

89

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-hidden="true"] elements contain focusable descendents

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>).

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

Best Practices

jabble.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

SEO Factors

jabble.jp SEO score

100

Search Engine Optimization Advices

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 Jabble.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 Jabble.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 Jabble. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: