Access bsac.co.jp. BSAC JAPAN公式サイト（スクーバダイビング指導団体）世界最古の歴史と伝統を持つダイビングクラブ

Report Summary

About Website

Click here to check amazing BSAC content. Otherwise, check out these important facts you probably never knew about bsac.co.jp

BSACは、世界で最も歴史と伝統のあるダイビングクラブです。スクーバダイビング指導団体として、Cカード（ダイビングライセンス）発行・ダイビングショップ（ダイブセンター）のご案内・インストラクターの指導と育成などを行っています。

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name

value

score

weighting

FCP (First Contentful Paint)

Value4.7 s

13/100

10%

LCP (Largest Contentful Paint)

Value12.7 s

0/100

25%

SI (Speed Index)

Value14.1 s

1/100

10%

TBT (Total Blocking Time)

Value340 ms

74/100

30%

CLS (Cumulative Layout Shift)

Value0.184

66/100

15%

TTI (Time to Interactive)

Value11.1 s

20/100

10%

bsac.co.jp

775 ms

www.bsac.co.jp

1112 ms

gtm.js

61 ms

gtm.js

72 ms

base.css

538 ms

Our browser made a total of 51 requests to load all elements on the main page. We found that 88% of them (45 requests) were addressed to the original Bsac.co.jp, 6% (3 requests) were made to Googletagmanager.com and 2% (1 request) were made to Fonts.googleapis.com. The less responsive or slowest element that took the longest time to load (4.7 sec) belongs to the original domain Bsac.co.jp.

Content Size

5.2 MB

After Optimization

4.9 MB

In fact, the total size of Bsac.co.jp main page is 5.2 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. Images take 4.9 MB which makes up the majority of the site volume.

HTML Optimization

-72%

Potential reduce by 18.6 kB

Original 25.8 kB
After minification 22.4 kB
After compression 7.2 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 3.4 kB, which is 13% 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 18.6 kB or 72% of the original size.

Image Optimization

-0%

Potential reduce by 1.3 kB

Original 4.9 MB
After minification 4.9 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. BSAC images are well optimized though.

JavaScript Optimization

-44%

Potential reduce by 35.4 kB

Original 81.0 kB
After minification 78.1 kB
After compression 45.7 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 35.4 kB or 44% of the original size.

CSS Optimization

-84%

Potential reduce by 160.5 kB

Original 191.8 kB
After minification 167.1 kB
After compression 31.3 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. Bsac.co.jp needs all CSS files to be minified and compressed as it can save up to 160.5 kB or 84% of the original size.

Requests Now

After Optimization

The browser has sent 49 CSS, Javascripts, AJAX and image requests in order to completely render the main page of BSAC. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 7 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

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.

High

Links do not have a discernible name

These items highlight common accessibility best practices.

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

Search Engine Optimization Advices

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/).

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 Bsac.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 Bsac.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

bsac.co.jp

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

Report Summary

Performance

Accessibility

Best Practices

SEO

BSAC JAPAN公式サイト（スクーバダイビング指導団体）世界最古の歴史と伝統を持つダイビングクラブ

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)