Report Summary

  • 19

    Performance

    Renders faster than
    36% of other websites

  • 95

    Accessibility

    Visual factors better than
    that of 87% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 100

    SEO

    Google-friendlier than
    95% of websites

smile-zemi.jp

タブレットで学ぶ幼児・小学生・中学生・高校生向け通信教育|【公式】スマイルゼミ

Page Load Speed

4.6 sec in total

First Response

332 ms

Resources Loaded

4 sec

Page Rendered

267 ms

smile-zemi.jp screenshot

About Website

Visit smile-zemi.jp now to see the best up-to-date Smile Zemi content for Japan and also check out these interesting facts you probably never knew about smile-zemi.jp

タブレットで学ぶ幼児・小学生・中学生・高校生向け通信教育「スマイルゼミ」

Visit smile-zemi.jp

Key Findings

We analyzed Smile-zemi.jp page load time and found that the first response time was 332 ms and then it took 4.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 65% of websites can load faster.

Performance Metrics

smile-zemi.jp performance score

19

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.7 s

0/100

10%

LCP (Largest Contentful Paint)

Value15.6 s

0/100

25%

SI (Speed Index)

Value15.4 s

0/100

10%

TBT (Total Blocking Time)

Value1,430 ms

15/100

30%

CLS (Cumulative Layout Shift)

Value0.081

94/100

15%

TTI (Time to Interactive)

Value30.7 s

0/100

10%

Network Requests Diagram

smile-zemi.jp

332 ms

smile-zemi.jp

815 ms

style.css

936 ms

top.css

447 ms

top_ab.css

452 ms

Our browser made a total of 55 requests to load all elements on the main page. We found that 65% of them (36 requests) were addressed to the original Smile-zemi.jp, 5% (3 requests) were made to Google-analytics.com and 4% (2 requests) were made to Stats.g.doubleclick.net. The less responsive or slowest element that took the longest time to load (1.4 sec) relates to the external source F1.zenclerk.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 434.8 kB (35%)

Content Size

1.2 MB

After Optimization

799.9 kB

In fact, the total size of Smile-zemi.jp main page is 1.2 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. 30% of websites need less resources to load. Images take 746.3 kB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 19.1 kB

  • Original 24.9 kB
  • After minification 22.8 kB
  • After compression 5.8 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 19.1 kB or 77% of the original size.

Image Optimization

-11%

Potential reduce by 80.0 kB

  • Original 746.3 kB
  • After minification 666.3 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. Obviously, Smile Zemi needs image optimization as it can save up to 80.0 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

-57%

Potential reduce by 128.2 kB

  • Original 226.7 kB
  • After minification 211.8 kB
  • After compression 98.5 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 128.2 kB or 57% of the original size.

CSS Optimization

-88%

Potential reduce by 207.5 kB

  • Original 236.7 kB
  • After minification 194.4 kB
  • After compression 29.2 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. Smile-zemi.jp needs all CSS files to be minified and compressed as it can save up to 207.5 kB or 88% of the original size.

Requests Breakdown

Number of requests can be reduced by 27 (52%)

Requests Now

52

After Optimization

25

The browser has sent 52 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Smile Zemi. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 13 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

smile-zemi.jp accessibility score

95

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.

Best Practices

smile-zemi.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

smile-zemi.jp SEO score

100

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

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 Smile-zemi.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 Smile-zemi.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 data is detected on the main page of Smile Zemi. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: