Report Summary

  • 19

    Performance

    Renders faster than
    37% of other websites

  • 91

    Accessibility

    Visual factors better than
    that of 78% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 100

    SEO

    Google-friendlier than
    95% of websites

jmsdf-kure-museum.go.jp

海上自衛隊呉史料館 | 愛称:てつのくじら館

Page Load Speed

3.6 sec in total

First Response

811 ms

Resources Loaded

2.6 sec

Page Rendered

194 ms

jmsdf-kure-museum.go.jp screenshot

About Website

Visit jmsdf-kure-museum.go.jp now to see the best up-to-date Jmsdf Kure Museum content for Japan and also check out these interesting facts you probably never knew about jmsdf-kure-museum.go.jp

海上自衛隊の機雷掃海と潜水艦の史料館

Visit jmsdf-kure-museum.go.jp

Key Findings

We analyzed Jmsdf-kure-museum.go.jp page load time and found that the first response time was 811 ms and then it took 2.8 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.

Performance Metrics

jmsdf-kure-museum.go.jp performance score

19

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.6 s

5/100

10%

LCP (Largest Contentful Paint)

Value18.8 s

0/100

25%

SI (Speed Index)

Value15.4 s

0/100

10%

TBT (Total Blocking Time)

Value510 ms

57/100

30%

CLS (Cumulative Layout Shift)

Value0.787

5/100

15%

TTI (Time to Interactive)

Value13.5 s

11/100

10%

Network Requests Diagram

jmsdf-kure-museum.go.jp

811 ms

style.css

396 ms

Script.js

402 ms

spacer.gif

201 ms

top_r1_c1.gif

217 ms

Our browser made a total of 42 requests to load all elements on the main page. We found that all of those requests were addressed to Jmsdf-kure-museum.go.jp and no external sources were called. The less responsive or slowest element that took the longest time to load (1.4 sec) belongs to the original domain Jmsdf-kure-museum.go.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 22.5 kB (29%)

Content Size

77.4 kB

After Optimization

54.9 kB

In fact, the total size of Jmsdf-kure-museum.go.jp main page is 77.4 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. Only 10% of websites need less resources to load. Images take 50.8 kB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 19.8 kB

  • Original 24.4 kB
  • After minification 22.7 kB
  • After compression 4.6 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 19.8 kB or 81% of the original size.

Image Optimization

-2%

Potential reduce by 1.2 kB

  • Original 50.8 kB
  • After minification 49.6 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. Jmsdf Kure Museum images are well optimized though.

JavaScript Optimization

-72%

Potential reduce by 1.3 kB

  • Original 1.9 kB
  • After minification 982 B
  • After compression 524 B

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 1.3 kB or 72% of the original size.

CSS Optimization

-50%

Potential reduce by 152 B

  • Original 306 B
  • After minification 227 B
  • After compression 154 B

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. Jmsdf-kure-museum.go.jp needs all CSS files to be minified and compressed as it can save up to 152 B or 50% of the original size.

Requests Breakdown

Number of requests can be reduced by 16 (39%)

Requests Now

41

After Optimization

25

The browser has sent 41 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Jmsdf Kure Museum. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests and as a result speed up the page load time.

Accessibility Review

jmsdf-kure-museum.go.jp accessibility score

91

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 input fields do not have accessible names

High

ARIA toggle fields do not have accessible names

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

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>).

Best Practices

jmsdf-kure-museum.go.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

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

jmsdf-kure-museum.go.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

    N/A

  • Encoding

    SHIFT_JIS

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Jmsdf-kure-museum.go.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 Jmsdf-kure-museum.go.jp main page’s claimed encoding is shift_jis. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

Open Graph description is not detected on the main page of Jmsdf Kure Museum. 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: