Report Summary

  • 30

    Performance

    Renders faster than
    50% of other websites

  • 92

    Accessibility

    Visual factors better than
    that of 80% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 83

    SEO

    Google-friendlier than
    46% of websites

yokohama-kagakukan.jp

はまぎん こども宇宙科学館 オフィシャルホームページ

Page Load Speed

12.3 sec in total

First Response

1.2 sec

Resources Loaded

10.8 sec

Page Rendered

275 ms

yokohama-kagakukan.jp screenshot

About Website

Click here to check amazing Yokohama Kagakukan content for Japan. Otherwise, check out these important facts you probably never knew about yokohama-kagakukan.jp

はまぎんこども宇宙科学館は横浜にある体験型の科学館です。楽しく遊びながら宇宙や科学に親しむ事ができます。プラネタリウムも星空観察会など施設・イベントも充実しております。さあ、宇宙や科学のおもしろさを一緒に体験しましょう

Visit yokohama-kagakukan.jp

Key Findings

We analyzed Yokohama-kagakukan.jp page load time and found that the first response time was 1.2 sec and then it took 11.1 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

yokohama-kagakukan.jp performance score

30

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.0 s

1/100

10%

LCP (Largest Contentful Paint)

Value17.6 s

0/100

25%

SI (Speed Index)

Value11.2 s

5/100

10%

TBT (Total Blocking Time)

Value180 ms

92/100

30%

CLS (Cumulative Layout Shift)

Value0.988

2/100

15%

TTI (Time to Interactive)

Value12.4 s

14/100

10%

Network Requests Diagram

www.yokohama-kagakukan.jp

1197 ms

base.css

336 ms

home.css

351 ms

style.css

357 ms

jquery.js

729 ms

Our browser made a total of 95 requests to load all elements on the main page. We found that 94% of them (89 requests) were addressed to the original Yokohama-kagakukan.jp, 3% (3 requests) were made to Weather.livedoor.com and 2% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (6.4 sec) belongs to the original domain Yokohama-kagakukan.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 2.1 MB (70%)

Content Size

2.9 MB

After Optimization

867.8 kB

In fact, the total size of Yokohama-kagakukan.jp main page is 2.9 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. 30% of websites need less resources to load. Images take 2.4 MB which makes up the majority of the site volume.

HTML Optimization

-76%

Potential reduce by 30.1 kB

  • Original 39.6 kB
  • After minification 36.0 kB
  • After compression 9.5 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 30.1 kB or 76% of the original size.

Image Optimization

-70%

Potential reduce by 1.7 MB

  • Original 2.4 MB
  • After minification 701.6 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, Yokohama Kagakukan needs image optimization as it can save up to 1.7 MB or 70% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-70%

Potential reduce by 338.2 kB

  • Original 486.5 kB
  • After minification 459.9 kB
  • After compression 148.4 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 338.2 kB or 70% of the original size.

CSS Optimization

-79%

Potential reduce by 30.7 kB

  • Original 39.1 kB
  • After minification 28.9 kB
  • After compression 8.4 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. Yokohama-kagakukan.jp needs all CSS files to be minified and compressed as it can save up to 30.7 kB or 79% of the original size.

Requests Breakdown

Number of requests can be reduced by 38 (41%)

Requests Now

93

After Optimization

55

The browser has sent 93 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Yokohama Kagakukan. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 25 to 1 for JavaScripts and from 9 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

yokohama-kagakukan.jp accessibility score

92

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.

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

Image elements do not have [alt] attributes

Best Practices

yokohama-kagakukan.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

yokohama-kagakukan.jp SEO score

83

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

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Yokohama-kagakukan.jp can be misinterpreted by Google and other search engines. Our service has detected that Japanese is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Yokohama-kagakukan.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 description is not detected on the main page of Yokohama Kagakukan. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: