Report Summary

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    Best Practices

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多摩六都科学館―プラネタリウムと観察・実験・工作でDo!サイエンス (東京都西東京市)

Page Load Speed

11.6 sec in total

First Response

1.1 sec

Resources Loaded

10.3 sec

Page Rendered

196 ms screenshot

About Website

Click here to check amazing Tamarokuto content for Japan. Otherwise, check out these important facts you probably never knew about

多摩六都科学館は、世界一に認定されたプラネタリウムと、観察・実験・工作が楽しめる体験型ミュージアムです。 東京都西東京市にあり、小平市、東村山市、清瀬市、東久留米市、西東京市の5市で運営しています。


Key Findings

We analyzed page load time and found that the first response time was 1.1 sec and then it took 10.5 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 performance score


Network Requests Diagram

1145 ms


1282 ms


321 ms


640 ms


336 ms

Our browser made a total of 97 requests to load all elements on the main page. We found that 97% of them (94 requests) were addressed to the original, 2% (2 requests) were made to and 1% (1 request) were made to The less responsive or slowest element that took the longest time to load (3.6 sec) belongs to the original domain

Page Optimization Overview & Recommendations

Page size can be reduced by 321.6 kB (26%)

Content Size

1.2 MB

After Optimization

917.2 kB

In fact, the total size of main page is 1.2 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. 25% of websites need less resources to load. Images take 855.6 kB which makes up the majority of the site volume.

HTML Optimization


Potential reduce by 24.5 kB

  • Original 31.5 kB
  • After minification 26.1 kB
  • After compression 7.0 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 5.4 kB, which is 17% 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 24.5 kB or 78% of the original size.

Image Optimization


Potential reduce by 35.8 kB

  • Original 855.6 kB
  • After minification 819.8 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. Tamarokuto images are well optimized though.

JavaScript Optimization


Potential reduce by 156.8 kB

  • Original 228.8 kB
  • After minification 195.8 kB
  • After compression 72.0 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 156.8 kB or 69% of the original size.

CSS Optimization


Potential reduce by 104.5 kB

  • Original 122.9 kB
  • After minification 93.5 kB
  • After compression 18.4 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. needs all CSS files to be minified and compressed as it can save up to 104.5 kB or 85% of the original size.

Requests Breakdown

Number of requests can be reduced by 30 (31%)

Requests Now


After Optimization


The browser has sent 96 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Tamarokuto. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts and from 22 to 1 for CSS and as a result speed up the page load time.

SEO Factors SEO score


Language and Encoding

  • Language Detected


  • Language Claimed


  • Encoding


Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 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 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 Tamarokuto. 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: