Tools & Wizards About Us

Report Summary

  • 44

    Performance

    Renders faster than
    63% of other websites

  • 81

    Accessibility

    Visual factors better than
    that of 52% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 92

    SEO

    Google-friendlier than
    75% of websites

coaster.jp

オリジナルコースター・紙コースターの印刷や作成・名入れ専門店【ART COASTER】

Page Load Speed

13.7 sec in total

First Response

513 ms

Resources Loaded

7.2 sec

Page Rendered

6 sec

About Website

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

オリジナルコースター印刷、作成・紙コースターの名入れなどに特化した専門店【ART COASTER】フルカラー1000枚を1万円でご提供！全国の飲食関連から広告業、印刷会社、デザイナー様などコースターを作りたいあなたの力になります。

Visit coaster.jp

Key Findings

We analyzed Coaster.jp page load time and found that the first response time was 513 ms and then it took 13.2 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

coaster.jp performance score

44

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.4 s

37/100

10%

LCP (Largest Contentful Paint)

Value6.7 s

8/100

25%

SI (Speed Index)

Value7.9 s

22/100

10%

TBT (Total Blocking Time)

Value120 ms

97/100

30%

CLS (Cumulative Layout Shift)

Value0.58

11/100

15%

TTI (Time to Interactive)

Value6.8 s

55/100

10%

Network Requests Diagram

coaster.jp

513 ms

www.coaster.jp

785 ms

import.css

313 ms

common.js

325 ms

AC_RunActiveContent.js

333 ms

Our browser made a total of 92 requests to load all elements on the main page. We found that 98% of them (90 requests) were addressed to the original Coaster.jp, 2% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (2.3 sec) belongs to the original domain Coaster.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 177.7 kB (56%)

Content Size

320.0 kB

After Optimization

142.3 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Coaster.jp main page is 320.0 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. 20% of websites need less resources to load. HTML takes 179.9 kB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 153.0 kB

  • Original 179.9 kB
  • After minification 179.0 kB
  • After compression 26.9 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 153.0 kB or 85% of the original size.

Image Optimization

-0%

Potential reduce by 278 B

  • Original 93.6 kB
  • After minification 93.3 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. COASTER images are well optimized though.

JavaScript Optimization

-26%

Potential reduce by 6.5 kB

  • Original 25.2 kB
  • After minification 22.3 kB
  • After compression 18.7 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 6.5 kB or 26% of the original size.

CSS Optimization

-84%

Potential reduce by 18.0 kB

  • Original 21.3 kB
  • After minification 15.3 kB
  • After compression 3.3 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. Coaster.jp needs all CSS files to be minified and compressed as it can save up to 18.0 kB or 84% of the original size.

Requests Breakdown

Number of requests can be reduced by 32 (36%)

Requests Now

90

After Optimization

58

  • Images
  • JavaScript
  • CSS

The browser has sent 90 CSS, Javascripts, AJAX and image requests in order to completely render the main page of COASTER. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

coaster.jp accessibility score

81

Accessibility Issues

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

These items highlight common accessibility best practices.

Impact

Issue

High

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

Best Practices

coaster.jp best practices score

67

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

High

Browser errors were logged to the console

SEO Factors

coaster.jp SEO score

92

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

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

    JA

  • Encoding

    SHIFT_JIS

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