Tools & Wizards About Us

Report Summary

  • 40

    Performance

    Renders faster than
    59% of other websites

  • 86

    Accessibility

    Visual factors better than
    that of 61% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 98

    SEO

    Google-friendlier than
    92% of websites

kokusaba.com

国サバ学習パートナーズ | 東京の国際的家庭教師サービス | 株式会社国際サバイバル | Kokusaba, Inc., Tokyo

Page Load Speed

4.7 sec in total

First Response

1.6 sec

Resources Loaded

3 sec

Page Rendered

80 ms

About Website

Click here to check amazing Kokusaba content. Otherwise, check out these important facts you probably never knew about kokusaba.com

学生が学生のために立ち上げた国際的家庭教師サービスです。多様化社会に向けて、生徒様一人一人に合せた授業を、いつでもどこでも提供いたします。Kokusaba is an internationally-minded tutoring network that helps students all over Japan expand their horizons and unlock their po...

Visit kokusaba.com

Key Findings

We analyzed Kokusaba.com page load time and found that the first response time was 1.6 sec and then it took 3.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.

Performance Metrics

kokusaba.com performance score

40

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.6 s

63/100

10%

LCP (Largest Contentful Paint)

Value5.6 s

18/100

25%

SI (Speed Index)

Value6.3 s

42/100

10%

TBT (Total Blocking Time)

Value950 ms

29/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value12.0 s

16/100

10%

Network Requests Diagram

www.kokusaba.com

1619 ms

originTrials.41d7301a.bundle.min.js

47 ms

minified.js

50 ms

focus-within-polyfill.js

49 ms

polyfill.min.js

99 ms

Our browser made a total of 55 requests to load all elements on the main page. We found that 2% of them (1 request) were addressed to the original Kokusaba.com, 44% (24 requests) were made to Static.wixstatic.com and 27% (15 requests) were made to Static.parastorage.com. The less responsive or slowest element that took the longest time to load (1.6 sec) belongs to the original domain Kokusaba.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 828.1 kB (60%)

Content Size

1.4 MB

After Optimization

550.2 kB

  • HTML
  • Images
  • JavaScript

In fact, the total size of Kokusaba.com main page is 1.4 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. HTML takes 961.5 kB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 791.4 kB

  • Original 961.5 kB
  • After minification 959.8 kB
  • After compression 170.1 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. 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 791.4 kB or 82% of the original size.

Image Optimization

-18%

Potential reduce by 34.0 kB

  • Original 187.7 kB
  • After minification 153.8 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, Kokusaba needs image optimization as it can save up to 34.0 kB or 18% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-1%

Potential reduce by 2.8 kB

  • Original 229.1 kB
  • After minification 229.0 kB
  • After compression 226.3 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. This website has mostly compressed JavaScripts.

Requests Breakdown

Number of requests can be reduced by 17 (33%)

Requests Now

51

After Optimization

34

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 51 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Kokusaba. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

kokusaba.com accessibility score

86

Accessibility Issues

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

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

kokusaba.com best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

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

kokusaba.com SEO score

98

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

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