26.2 sec in total
1.1 sec
23.1 sec
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Welcome to r-core.co.jp homepage info - get ready to check R Core best content for Japan right away, or after learning these important things about r-core.co.jp
都内新宿・渋谷・池袋エリアでマンションやアパートの賃貸物件をお探しのあなた!ゼロヘヤなら仲介手数料無料です!新築・築浅、分譲賃貸など、人気のキーワードから物件をお探しいただけます。
Visit r-core.co.jpWe analyzed R-core.co.jp page load time and found that the first response time was 1.1 sec and then it took 25.1 sec to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster.
r-core.co.jp performance score
name
value
score
weighting
Value7.9 s
0/100
10%
Value14.0 s
0/100
25%
Value13.0 s
2/100
10%
Value600 ms
49/100
30%
Value0.322
36/100
15%
Value11.7 s
17/100
10%
1126 ms
939 ms
342 ms
355 ms
386 ms
Our browser made a total of 149 requests to load all elements on the main page. We found that 81% of them (120 requests) were addressed to the original R-core.co.jp, 14% (21 requests) were made to Img-asp.jp and 2% (3 requests) were made to Cloud.ielove.jp. The less responsive or slowest element that took the longest time to load (15.7 sec) belongs to the original domain R-core.co.jp.
Page size can be reduced by 263.7 kB (5%)
5.0 MB
4.8 MB
In fact, the total size of R-core.co.jp main page is 5.0 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. 55% of websites need less resources to load. Images take 4.9 MB which makes up the majority of the site volume.
Potential reduce by 57.6 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. This page needs HTML code to be minified as it can gain 12.9 kB, which is 19% 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 57.6 kB or 83% of the original size.
Potential reduce by 146.1 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. R Core images are well optimized though.
Potential reduce by 46.4 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 46.4 kB or 64% of the original size.
Potential reduce by 13.7 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. R-core.co.jp needs all CSS files to be minified and compressed as it can save up to 13.7 kB or 79% of the original size.
Number of requests can be reduced by 13 (9%)
144
131
The browser has sent 144 CSS, Javascripts, AJAX and image requests in order to completely render the main page of R Core. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.
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r-core.co.jp accessibility score
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
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
Definition list items are not wrapped in <dl> elements
Lists do not contain only <li> elements and script supporting elements (<script> and <template>).
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
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
Image elements do not have [alt] attributes
Links do not have a discernible name
Best practices
These items highlight common accessibility best practices.
Impact
Issue
[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.
r-core.co.jp best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Displays images with incorrect aspect ratio
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
Page has valid source maps
r-core.co.jp SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
Page is blocked from indexing
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
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
Document uses legible font sizes
Tap targets are not sized appropriately
JA
JA
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise R-core.co.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 R-core.co.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.
r-core.co.jp
Open Graph data is detected on the main page of R Core. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: