Tools & Wizards About Us
railstutorial.jp screenshot

Report Summary

  • 22

    Performance

    Renders faster than
    40% of other websites

  • 94

    Accessibility

    Visual factors better than
    that of 84% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 96

    SEO

    Google-friendlier than
    91% of websites

railstutorial.jp

Ruby on Rails チュートリアル：プロダクト開発の０→１を学ぼう

Page Load Speed

3.1 sec in total

First Response

216 ms

Resources Loaded

1.7 sec

Page Rendered

1.3 sec

railstutorial.jp screenshot

About Website

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

SNS開発やWebサイト制作が学べる大型チュートリアル。作りながら学ぶのが特徴で、電子書籍や解説動画、質問対応、社員研修、教材利用にも対応しています。

Visit railstutorial.jp

Key Findings

We analyzed Railstutorial.jp page load time and found that the first response time was 216 ms and then it took 2.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Performance Metrics

railstutorial.jp performance score

22

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.5 s

14/100

10%

LCP (Largest Contentful Paint)

Value6.0 s

13/100

25%

SI (Speed Index)

Value9.6 s

11/100

10%

TBT (Total Blocking Time)

Value3,240 ms

2/100

30%

CLS (Cumulative Layout Shift)

Value0.013

100/100

15%

TTI (Time to Interactive)

Value18.8 s

3/100

10%

Network Requests Diagram

railstutorial.jp

216 ms

pygments.css

91 ms

softcover.css

106 ms

custom.css

29 ms

screen.css

134 ms

Our browser made a total of 73 requests to load all elements on the main page. We found that 37% of them (27 requests) were addressed to the original Railstutorial.jp, 16% (12 requests) were made to Public.slidesharecdn.com and 7% (5 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (545 ms) belongs to the original domain Railstutorial.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 436.6 kB (52%)

Content Size

831.8 kB

After Optimization

395.2 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Railstutorial.jp main page is 831.8 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. 70% of websites need less resources to load. Javascripts take 348.7 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 87.1 kB

  • Original 109.7 kB
  • After minification 102.3 kB
  • After compression 22.6 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 87.1 kB or 79% of the original size.

Image Optimization

-11%

Potential reduce by 25.9 kB

  • Original 226.7 kB
  • After minification 200.7 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, Rails Tutorial needs image optimization as it can save up to 25.9 kB or 11% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-61%

Potential reduce by 211.9 kB

  • Original 348.7 kB
  • After minification 339.3 kB
  • After compression 136.8 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 211.9 kB or 61% of the original size.

CSS Optimization

-76%

Potential reduce by 111.7 kB

  • Original 146.7 kB
  • After minification 137.0 kB
  • After compression 35.1 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. Railstutorial.jp needs all CSS files to be minified and compressed as it can save up to 111.7 kB or 76% of the original size.

Requests Breakdown

Number of requests can be reduced by 35 (49%)

Requests Now

71

After Optimization

36

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 71 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Rails Tutorial. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 19 to 1 for JavaScripts and from 9 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

railstutorial.jp

railstutorial.jp

216 ms

pygments.css

pygments.css

91 ms

softcover.css

softcover.css

106 ms

custom.css

custom.css

29 ms

screen.css

screen.css

134 ms

MathJax.js

MathJax.js

15 ms

bookmark_button.js

bookmark_button.js

486 ms

analytics.js

analytics.js

66 ms

mixpanel-2.2.min.js

mixpanel-2.2.min.js

67 ms

TeX-AMS_HTML.js

TeX-AMS_HTML.js

50 ms

dTTiiBKIo80sNs

dTTiiBKIo80sNs

345 ms

sdk.js

sdk.js

304 ms

widgets.js

widgets.js

21 ms

background.png

background.png

292 ms

book_header.png

book_header.png

297 ms

logo.png

logo.png

315 ms

title.png

title.png

293 ms

author.png

author.png

292 ms

book_menu.png

book_menu.png

306 ms

sb_button_up.png

sb_button_up.png

312 ms

sb_button_prev-ba223c8d9bceb768c3e503906bd5876e.png

sb_button_prev-ba223c8d9bceb768c3e503906bd5876e.png

314 ms

sb_button_next-2018f09b6d56ec04ec43bfb0cf53741a.png

sb_button_next-2018f09b6d56ec04ec43bfb0cf53741a.png

304 ms

help-icon24x24.png

help-icon24x24.png

316 ms

email-icon24x24.png

email-icon24x24.png

314 ms

twitter-icon24x24.png

twitter-icon24x24.png

315 ms

github-icon24x24.png

github-icon24x24.png

316 ms

report_button.png

report_button.png

393 ms

railsguides.png

railsguides.png

392 ms

railsseminar.jpg

railsseminar.jpg

394 ms

book_top.png

book_top.png

392 ms

book_bg.png

book_bg.png

364 ms

yasslab_logo.png

yasslab_logo.png

388 ms

railscp_bronze_logo.png

railscp_bronze_logo.png

545 ms

book_bottom.png

book_bottom.png

393 ms

button-only@2x.png

button-only@2x.png

361 ms

collect

collect

139 ms

78 ms

button.831500944bc3eb7ea5276ccdc3f71d2e.js

button.831500944bc3eb7ea5276ccdc3f71d2e.js

126 ms

combined_jquery.js

combined_jquery.js

100 ms

global.js

global.js

90 ms

combined_li_tracking.js

combined_li_tracking.js

87 ms

font-awesome.css

font-awesome.css

86 ms

combined_presentation.css

combined_presentation.css

126 ms

combined_player_presentation.js

combined_player_presentation.js

135 ms

combined_old_embed.js

combined_old_embed.js

132 ms

267 ms

316 ms

xd_arbiter.php

xd_arbiter.php

241 ms

xd_arbiter.php

xd_arbiter.php

418 ms

combined_base.js

combined_base.js

131 ms

ga.js

ga.js

122 ms

beacon.js

beacon.js

121 ms

rails-3-1-638.jpg

rails-3-1-638.jpg

190 ms

54345184

54345184

139 ms

lead-form

lead-form

249 ms

1x1.gif

1x1.gif

103 ms

logo_embed_100x20_v1.png

logo_embed_100x20_v1.png

102 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

103 ms

icons.svg

icons.svg

101 ms

tweet_button.6a78875565a912489e9aef879c881358.ja.html

tweet_button.6a78875565a912489e9aef879c881358.ja.html

79 ms

print.css

print.css

89 ms

__utm.gif

__utm.gif

107 ms

status

status

96 ms

__utm.gif

__utm.gif

102 ms

reset.css

reset.css

58 ms

entry-button.css

entry-button.css

59 ms

bbtn-l_v3.png

bbtn-l_v3.png

11 ms

nr-885.min.js

nr-885.min.js

31 ms

344f7aca68

344f7aca68

57 ms

jot

jot

92 ms

like.php

like.php

98 ms

vpc6VNjRPXV.js

vpc6VNjRPXV.js

287 ms

LVx-xkvaJ0b.png

LVx-xkvaJ0b.png

318 ms

Accessibility Review

railstutorial.jp accessibility score

94

Accessibility Issues

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

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

railstutorial.jp best practices score

75

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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

railstutorial.jp SEO score

96

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

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    JA

  • Language Claimed

    JA

  • Encoding

    UTF-8

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

railstutorial.jp

Open Graph data is detected on the main page of Rails Tutorial. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: