Tools & Wizards About Us
java.it-manual.com screenshot

Report Summary

  • 95

    Performance

    Renders faster than
    93% of other websites

  • 55

    Accessibility

    Visual factors better than
    that of 23% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 69

    SEO

    Google-friendlier than
    28% of websites

java.it-manual.com

Javaプログラミング講座　Javaプログラム開発の入門・基礎・応用

Page Load Speed

3.5 sec in total

First Response

628 ms

Resources Loaded

2.5 sec

Page Rendered

378 ms

java.it-manual.com screenshot

About Website

Welcome to java.it-manual.com homepage info - get ready to check Java It Manual best content for Japan right away, or after learning these important things about java.it-manual.com

Javaプログラミング講座は、初心者から中級者向けのサイトです。Javaプログラム開発を初めて経験する方から、ある程度経験された方まで、幅広くご利用いただけます。

Visit java.it-manual.com

Key Findings

We analyzed Java.it-manual.com page load time and found that the first response time was 628 ms and then it took 2.8 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

java.it-manual.com performance score

95

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.6 s

94/100

10%

LCP (Largest Contentful Paint)

Value2.4 s

91/100

25%

SI (Speed Index)

Value2.9 s

94/100

10%

TBT (Total Blocking Time)

Value30 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.021

100/100

15%

TTI (Time to Interactive)

Value4.6 s

82/100

10%

Network Requests Diagram

java.it-manual.com

628 ms

init.css

169 ms

common.css

318 ms

brand

15 ms

sitelogo.gif

315 ms

Our browser made a total of 79 requests to load all elements on the main page. We found that 28% of them (22 requests) were addressed to the original Java.it-manual.com, 22% (17 requests) were made to Ecx.images-amazon.com and 11% (9 requests) were made to A.image.accesstrade.net. The less responsive or slowest element that took the longest time to load (1.5 sec) relates to the external source Www22.a8.net.

Page Optimization Overview & Recommendations

Page size can be reduced by 51.9 kB (36%)

Content Size

143.0 kB

After Optimization

91.1 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Java.it-manual.com main page is 143.0 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. Images take 62.1 kB which makes up the majority of the site volume.

HTML Optimization

-75%

Potential reduce by 24.9 kB

  • Original 33.3 kB
  • After minification 30.7 kB
  • After compression 8.3 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 24.9 kB or 75% of the original size.

Image Optimization

-1%

Potential reduce by 761 B

  • Original 62.1 kB
  • After minification 61.3 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. Java It Manual images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 34 B

  • Original 17.2 kB
  • After minification 17.2 kB
  • After compression 17.1 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

-86%

Potential reduce by 26.2 kB

  • Original 30.5 kB
  • After minification 22.9 kB
  • After compression 4.3 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. Java.it-manual.com needs all CSS files to be minified and compressed as it can save up to 26.2 kB or 86% of the original size.

Requests Breakdown

Number of requests can be reduced by 29 (38%)

Requests Now

77

After Optimization

48

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 77 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Java It Manual. 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.

Network Requests Diagram

java.it-manual.com

java.it-manual.com

628 ms

init.css

init.css

169 ms

common.css

common.css

318 ms

brand

brand

15 ms

sitelogo.gif

sitelogo.gif

315 ms

widget.js

widget.js

821 ms

brand

brand

61 ms

bgt

bgt

584 ms

0.gif

0.gif

357 ms

0.gif

0.gif

383 ms

bgt

bgt

389 ms

0.gif

0.gif

820 ms

0.gif

0.gif

524 ms

bgt

bgt

1108 ms

bgt

bgt

1014 ms

0.gif

0.gif

325 ms

bgt

bgt

348 ms

0.gif

0.gif

372 ms

0.gif

0.gif

349 ms

51E1m-weAXL._SL160_.jpg

51E1m-weAXL._SL160_.jpg

43 ms

ir

ir

163 ms

0.gif

0.gif

332 ms

0.gif

0.gif

354 ms

0.gif

0.gif

823 ms

0.gif

0.gif

376 ms

bgt

bgt

1471 ms

bg-body.gif

bg-body.gif

336 ms

ico-arrow002.gif

ico-arrow002.gif

161 ms

serch-box.gif

serch-box.gif

161 ms

main-java.gif

main-java.gif

320 ms

main-java-news.gif

main-java-news.gif

316 ms

main-job-change.gif

main-job-change.gif

327 ms

unitTitle-it-manual-com.gif

unitTitle-it-manual-com.gif

341 ms

unitTitle-book.gif

unitTitle-book.gif

372 ms

ir

ir

155 ms

ir

ir

156 ms

ir

ir

184 ms

51ixZgujIZL._SL160_.jpg

51ixZgujIZL._SL160_.jpg

30 ms

51Jtg0H7XPL._SL160_.jpg

51Jtg0H7XPL._SL160_.jpg

28 ms

51GfzNBcdSL._SL160_.jpg

51GfzNBcdSL._SL160_.jpg

28 ms

bg-gnav.gif

bg-gnav.gif

459 ms

navTop-01.gif

navTop-01.gif

461 ms

navStart-01.gif

navStart-01.gif

464 ms

navMethod-01.gif

navMethod-01.gif

477 ms

navClasses-01.gif

navClasses-01.gif

517 ms

navCast-01.gif

navCast-01.gif

531 ms

navAdvanced-01.gif

navAdvanced-01.gif

603 ms

navDB-01.gif

navDB-01.gif

606 ms

navApplication-01.gif

navApplication-01.gif

628 ms

ico-arrow001.gif

ico-arrow001.gif

645 ms

google_custom_search_watermark.gif

google_custom_search_watermark.gif

57 ms

cm

cm

201 ms

cm

cm

209 ms

ga.js

ga.js

27 ms

null_image.gif

null_image.gif

40 ms

2016_wp_120x60.jpg

2016_wp_120x60.jpg

530 ms

null_image.gif

null_image.gif

39 ms

null_image.gif

null_image.gif

38 ms

null_image.gif

null_image.gif

37 ms

__utm.gif

__utm.gif

24 ms

null_image.gif

null_image.gif

10 ms

140x25-b-amzn.gif

140x25-b-amzn.gif

7 ms

185 ms

51QsmvkObML._SL60_.jpg

51QsmvkObML._SL60_.jpg

18 ms

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51nSK4pE-RL._SL60_.jpg

17 ms

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51p9hgkvLCL._SL60_.jpg

6 ms

51Ex6xWcUrL._SL60_.jpg

51Ex6xWcUrL._SL60_.jpg

16 ms

61DHJGf1uSL._SL60_.jpg

61DHJGf1uSL._SL60_.jpg

17 ms

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51Uuh7eHOqL._SL60_.jpg

18 ms

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51HxdJTj3uL._SL60_.jpg

18 ms

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12 ms

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51WNw-FIQdL._SL60_.jpg

18 ms

61j7dM5MCsL._SL60_.jpg

61j7dM5MCsL._SL60_.jpg

21 ms

51yDjvCseTL._SL60_.jpg

51yDjvCseTL._SL60_.jpg

12 ms

615o2nXMLLL._SL60_.jpg

615o2nXMLLL._SL60_.jpg

16 ms

192 ms

120_60_1.gif

120_60_1.gif

321 ms

null_image.gif

null_image.gif

10 ms

null_image.gif

null_image.gif

9 ms

Accessibility Review

java.it-manual.com accessibility score

55

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

Form elements do not have associated labels

High

Links do not have a discernible name

Best Practices

java.it-manual.com best practices score

67

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

High

Browser errors were logged to the console

SEO Factors

java.it-manual.com SEO score

69

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

    JA

  • Encoding

    SHIFT_JIS

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Java.it-manual.com 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 Java.it-manual.com 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

java.it-manual.com

Open Graph description is not detected on the main page of Java It Manual. 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: