Tools & Wizards About Us
jack-b.jp screenshot

Report Summary

  • 57

    Performance

    Renders faster than
    73% of other websites

  • 82

    Accessibility

    Visual factors better than
    that of 52% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 67

    SEO

    Google-friendlier than
    26% of websites

jack-b.jp

生地・布素材店「JACK＆B」｜ニット生地 通販｜

Page Load Speed

2.7 sec in total

First Response

745 ms

Resources Loaded

1.8 sec

Page Rendered

201 ms

jack-b.jp screenshot

About Website

Click here to check amazing JACK B content for Japan. Otherwise, check out these important facts you probably never knew about jack-b.jp

生地・布素材店「JACKB」では良い布をより安くお届けしています

Visit jack-b.jp

Key Findings

We analyzed Jack-b.jp page load time and found that the first response time was 745 ms and then it took 2 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

jack-b.jp performance score

57

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.9 s

88/100

10%

LCP (Largest Contentful Paint)

Value5.1 s

26/100

25%

SI (Speed Index)

Value6.5 s

39/100

10%

TBT (Total Blocking Time)

Value390 ms

68/100

30%

CLS (Cumulative Layout Shift)

Value0.006

100/100

15%

TTI (Time to Interactive)

Value10.5 s

23/100

10%

Network Requests Diagram

jack-b.jp

745 ms

font.css

333 ms

cse.js

42 ms

analytics.js

43 ms

0f641bd8a572707d72595956ca5b8853.jpg

73 ms

Our browser made a total of 64 requests to load all elements on the main page. We found that 22% of them (14 requests) were addressed to the original Jack-b.jp, 34% (22 requests) were made to Static.xx.fbcdn.net and 11% (7 requests) were made to Google.com. The less responsive or slowest element that took the longest time to load (838 ms) belongs to the original domain Jack-b.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 37.8 kB (3%)

Content Size

1.1 MB

After Optimization

1.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Jack-b.jp main page is 1.1 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. 65% of websites need less resources to load. Images take 879.8 kB which makes up the majority of the site volume.

HTML Optimization

-72%

Potential reduce by 20.6 kB

  • Original 28.4 kB
  • After minification 24.5 kB
  • After compression 7.8 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 4.0 kB, which is 14% 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 20.6 kB or 72% of the original size.

Image Optimization

-1%

Potential reduce by 4.6 kB

  • Original 879.8 kB
  • After minification 875.2 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. JACK B images are well optimized though.

JavaScript Optimization

-2%

Potential reduce by 4.3 kB

  • Original 177.2 kB
  • After minification 176.9 kB
  • After compression 172.9 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. This website has mostly compressed JavaScripts.

CSS Optimization

-52%

Potential reduce by 8.4 kB

  • Original 16.0 kB
  • After minification 15.4 kB
  • After compression 7.6 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. Jack-b.jp needs all CSS files to be minified and compressed as it can save up to 8.4 kB or 52% of the original size.

Requests Breakdown

Number of requests can be reduced by 26 (43%)

Requests Now

61

After Optimization

35

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 61 CSS, Javascripts, AJAX and image requests in order to completely render the main page of JACK B. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 22 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

jack-b.jp

jack-b.jp

745 ms

font.css

font.css

333 ms

cse.js

cse.js

42 ms

analytics.js

analytics.js

43 ms

0f641bd8a572707d72595956ca5b8853.jpg

0f641bd8a572707d72595956ca5b8853.jpg

73 ms

kanri.cgi

kanri.cgi

189 ms

f1efeb91c082cf1763e645171d14f957.jpg

f1efeb91c082cf1763e645171d14f957.jpg

69 ms

c2de8c77f70791b5650183a7f96b4427.jpg

c2de8c77f70791b5650183a7f96b4427.jpg

72 ms

logo2014.png

logo2014.png

188 ms

logo0410_04.gif

logo0410_04.gif

323 ms

top-NTB-0333s.jpg

top-NTB-0333s.jpg

495 ms

top-NTB-9346s.jpg

top-NTB-9346s.jpg

499 ms

2021_0905-j1s.png

2021_0905-j1s.png

723 ms

ba_01.jpg

ba_01.jpg

336 ms

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2021_0905-j4.png

725 ms

2021_0905-j3.png

2021_0905-j3.png

803 ms

top_3s.png

top_3s.png

838 ms

top_1.png

top_1.png

825 ms

top_2s.png

top_2s.png

834 ms

cse.js

cse.js

83 ms

likebox.php

likebox.php

488 ms

collect

collect

37 ms

collect

collect

35 ms

js

js

98 ms

cse_element__ja.js

cse_element__ja.js

19 ms

default+ja.css

default+ja.css

61 ms

default.css

default.css

63 ms

async-ads.js

async-ads.js

26 ms

branding.png

branding.png

86 ms

clear.png

clear.png

82 ms

nav_logo114.png

nav_logo114.png

83 ms

65zeFj4kaoH.css

65zeFj4kaoH.css

24 ms

Ql-UNnxapLj.css

Ql-UNnxapLj.css

28 ms

igEduAV3QIA.css

igEduAV3QIA.css

32 ms

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Accessibility Review

jack-b.jp accessibility score

82

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Best Practices

jack-b.jp best practices score

58

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

High

Browser errors were logged to the console

SEO Factors

jack-b.jp SEO score

67

Search Engine Optimization Advices

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

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 Jack-b.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 Jack-b.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

jack-b.jp

Open Graph description is not detected on the main page of JACK B. 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: