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dammaps.jp screenshot

Report Summary

  • 26

    Performance

    Renders faster than
    45% of other websites

  • 83

    Accessibility

    Visual factors better than
    that of 54% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 58

    SEO

    Google-friendlier than
    21% of websites

dammaps.jp

DamMaps - 日本全国Web地図でダムめぐり

Page Load Speed

3.4 sec in total

First Response

671 ms

Resources Loaded

2.7 sec

Page Rendered

76 ms

dammaps.jp screenshot

About Website

Welcome to dammaps.jp homepage info - get ready to check Dam Maps best content for Japan right away, or after learning these important things about dammaps.jp

一般財団法人 日本ダム協会が運営するダム便覧のデータに基づき、地図によるダム情報を提供するサイトです。

Visit dammaps.jp

Key Findings

We analyzed Dammaps.jp page load time and found that the first response time was 671 ms and then it took 2.7 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

dammaps.jp performance score

26

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.8 s

11/100

10%

LCP (Largest Contentful Paint)

Value11.3 s

0/100

25%

SI (Speed Index)

Value10.2 s

8/100

10%

TBT (Total Blocking Time)

Value1,120 ms

23/100

30%

CLS (Cumulative Layout Shift)

Value0.002

100/100

15%

TTI (Time to Interactive)

Value11.4 s

19/100

10%

Network Requests Diagram

dammaps.jp

671 ms

dammaps.jp

848 ms

js

63 ms

js

84 ms

jquery.min.js

30 ms

Our browser made a total of 17 requests to load all elements on the main page. We found that 53% of them (9 requests) were addressed to the original Dammaps.jp, 18% (3 requests) were made to Ajax.googleapis.com and 12% (2 requests) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (909 ms) belongs to the original domain Dammaps.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 275.7 kB (56%)

Content Size

488.8 kB

After Optimization

213.0 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Dammaps.jp main page is 488.8 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. 25% of websites need less resources to load. Javascripts take 459.1 kB which makes up the majority of the site volume.

HTML Optimization

-70%

Potential reduce by 5.5 kB

  • Original 7.8 kB
  • After minification 6.9 kB
  • After compression 2.3 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. This page needs HTML code to be minified as it can gain 939 B, which is 12% 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 5.5 kB or 70% of the original size.

Image Optimization

-35%

Potential reduce by 5.9 kB

  • Original 16.7 kB
  • After minification 10.8 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. Obviously, Dam Maps needs image optimization as it can save up to 5.9 kB or 35% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-57%

Potential reduce by 260.6 kB

  • Original 459.1 kB
  • After minification 431.8 kB
  • After compression 198.5 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 260.6 kB or 57% of the original size.

CSS Optimization

-72%

Potential reduce by 3.7 kB

  • Original 5.1 kB
  • After minification 4.3 kB
  • After compression 1.4 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. Dammaps.jp needs all CSS files to be minified and compressed as it can save up to 3.7 kB or 72% of the original size.

Requests Breakdown

Number of requests can be reduced by 8 (53%)

Requests Now

15

After Optimization

7

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 15 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dam Maps. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

dammaps.jp

dammaps.jp

671 ms

dammaps.jp

dammaps.jp

848 ms

js

js

63 ms

js

js

84 ms

jquery.min.js

jquery.min.js

30 ms

jquery-ui.css

jquery-ui.css

38 ms

jquery-ui.min.js

jquery-ui.min.js

48 ms

markermanager.js

markermanager.js

424 ms

dammaps.js

dammaps.js

909 ms

dammaps_const.js

dammaps_const.js

556 ms

main.css

main.css

632 ms

control.css

control.css

630 ms

js

js

56 ms

analytics.js

analytics.js

18 ms

collect

collect

12 ms

title_logo.png

title_logo.png

207 ms

iconexp.png

iconexp.png

182 ms

Accessibility Review

dammaps.jp accessibility score

83

Accessibility Issues

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

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

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

dammaps.jp best practices score

75

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

Page has valid source maps

SEO Factors

dammaps.jp SEO score

58

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

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

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Dammaps.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 Dammaps.jp main page’s claimed encoding is iso-8859-1. 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

dammaps.jp

Open Graph description is not detected on the main page of Dam Maps. 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: