Report Summary

  • 10

    Performance

    Renders faster than
    23% of other websites

  • 77

    Accessibility

    Visual factors better than
    that of 45% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 85

    SEO

    Google-friendlier than
    56% of websites

dai-one.jp

中古スマホ・中古携帯・白ロムの激安販売ならダイワンテレコム

Page Load Speed

14.5 sec in total

First Response

4 sec

Resources Loaded

10 sec

Page Rendered

489 ms

dai-one.jp screenshot

About Website

Visit dai-one.jp now to see the best up-to-date Dai One content for Japan and also check out these interesting facts you probably never knew about dai-one.jp

中古スマホ・中古携帯・白ロム・iPhone・Androidの格安スマホ通信販売!新品携帯から中古携帯まで豊富な品揃え。最短即日配送で商品保証も充実です。SIMフリー端末からガラケーまで取扱いしております。中古スマートフォンを購入するならダイワン!

Visit dai-one.jp

Key Findings

We analyzed Dai-one.jp page load time and found that the first response time was 4 sec and then it took 10.5 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

dai-one.jp performance score

10

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.6 s

2/100

10%

LCP (Largest Contentful Paint)

Value14.9 s

0/100

25%

SI (Speed Index)

Value10.6 s

7/100

10%

TBT (Total Blocking Time)

Value1,240 ms

19/100

30%

CLS (Cumulative Layout Shift)

Value0.423

23/100

15%

TTI (Time to Interactive)

Value18.6 s

3/100

10%

Network Requests Diagram

dai-one.jp

4018 ms

import.css

389 ms

require.js

406 ms

reset.css

215 ms

common.css

844 ms

Our browser made a total of 160 requests to load all elements on the main page. We found that 98% of them (156 requests) were addressed to the original Dai-one.jp, 1% (2 requests) were made to Smarticon.geotrust.com and 1% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (4 sec) belongs to the original domain Dai-one.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 495.3 kB (26%)

Content Size

1.9 MB

After Optimization

1.4 MB

In fact, the total size of Dai-one.jp main page is 1.9 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. 35% of websites need less resources to load. Images take 1.4 MB which makes up the majority of the site volume.

HTML Optimization

-88%

Potential reduce by 101.7 kB

  • Original 115.1 kB
  • After minification 61.0 kB
  • After compression 13.4 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 54.1 kB, which is 47% 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 101.7 kB or 88% of the original size.

Image Optimization

-9%

Potential reduce by 131.6 kB

  • Original 1.4 MB
  • After minification 1.3 MB

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. Dai One images are well optimized though.

JavaScript Optimization

-68%

Potential reduce by 167.9 kB

  • Original 245.6 kB
  • After minification 200.1 kB
  • After compression 77.7 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 167.9 kB or 68% of the original size.

CSS Optimization

-84%

Potential reduce by 94.1 kB

  • Original 112.4 kB
  • After minification 74.3 kB
  • After compression 18.3 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. Dai-one.jp needs all CSS files to be minified and compressed as it can save up to 94.1 kB or 84% of the original size.

Requests Breakdown

Number of requests can be reduced by 51 (32%)

Requests Now

159

After Optimization

108

The browser has sent 159 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dai One. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 18 to 1 for JavaScripts and from 17 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

dai-one.jp accessibility score

77

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.

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

<dl>'s do not contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements.

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

dai-one.jp best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

dai-one.jp SEO score

85

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

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 Dai-one.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 Dai-one.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

Open Graph description is not detected on the main page of Dai One. 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: