Report Summary

  • 40

    Performance

    Renders faster than
    60% of other websites

  • 88

    Accessibility

    Visual factors better than
    that of 69% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 89

    SEO

    Google-friendlier than
    67% of websites

seoulmetro.co.kr

서울교통공사

Page Load Speed

33.4 sec in total

First Response

2.8 sec

Resources Loaded

30.4 sec

Page Rendered

238 ms

seoulmetro.co.kr screenshot

About Website

Click here to check amazing Seoulmetro content for South Korea. Otherwise, check out these important facts you probably never knew about seoulmetro.co.kr

서울교통공사

Visit seoulmetro.co.kr

Key Findings

We analyzed Seoulmetro.co.kr page load time and found that the first response time was 2.8 sec and then it took 30.6 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.

Performance Metrics

seoulmetro.co.kr performance score

40

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value12.3 s

0/100

10%

LCP (Largest Contentful Paint)

Value21.9 s

0/100

25%

SI (Speed Index)

Value15.2 s

1/100

10%

TBT (Total Blocking Time)

Value300 ms

79/100

30%

CLS (Cumulative Layout Shift)

Value0.042

99/100

15%

TTI (Time to Interactive)

Value14.2 s

9/100

10%

Network Requests Diagram

seoulmetro.co.kr

2793 ms

common.js

720 ms

main.action

4130 ms

import.css

510 ms

jquery-latest.js

3674 ms

Our browser made a total of 106 requests to load all elements on the main page. We found that 54% of them (57 requests) were addressed to the original Seoulmetro.co.kr, 33% (35 requests) were made to Static.xx.fbcdn.net and 10% (11 requests) were made to Scontent.xx.fbcdn.net. The less responsive or slowest element that took the longest time to load (20 sec) relates to the external source Seoul.go.kr.

Page Optimization Overview & Recommendations

Page size can be reduced by 358.9 kB (65%)

Content Size

555.0 kB

After Optimization

196.1 kB

In fact, the total size of Seoulmetro.co.kr main page is 555.0 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. 55% of websites need less resources to load. Javascripts take 348.2 kB which makes up the majority of the site volume.

HTML Optimization

-38%

Potential reduce by 330 B

  • Original 868 B
  • After minification 861 B
  • After compression 538 B

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 330 B or 38% of the original size.

Image Optimization

-17%

Potential reduce by 28.4 kB

  • Original 165.0 kB
  • After minification 136.6 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, Seoulmetro needs image optimization as it can save up to 28.4 kB or 17% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-85%

Potential reduce by 295.5 kB

  • Original 348.2 kB
  • After minification 187.0 kB
  • After compression 52.7 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 295.5 kB or 85% of the original size.

CSS Optimization

-85%

Potential reduce by 34.7 kB

  • Original 41.0 kB
  • After minification 35.7 kB
  • After compression 6.3 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. Seoulmetro.co.kr needs all CSS files to be minified and compressed as it can save up to 34.7 kB or 85% of the original size.

Requests Breakdown

Number of requests can be reduced by 36 (35%)

Requests Now

104

After Optimization

68

The browser has sent 104 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Seoulmetro. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 27 to 1 for JavaScripts and from 11 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

seoulmetro.co.kr accessibility score

88

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

[aria-hidden="true"] elements contain focusable descendents

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

High

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

Best Practices

seoulmetro.co.kr best practices score

67

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

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

seoulmetro.co.kr SEO score

89

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

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

    N/A

  • Language Claimed

    KO

  • Encoding

    EUC-KR

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Seoulmetro.co.kr can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else), while the claimed language is Korean. Our system also found out that Seoulmetro.co.kr main page’s claimed encoding is euc-kr. 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

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