Tools & Wizards About Us

Report Summary

  • 5

    Performance

    Renders faster than
    21% of other websites

  • 74

    Accessibility

    Visual factors better than
    that of 40% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 76

    SEO

    Google-friendlier than
    35% of websites

opencollege.kr

오픈컬리지

Page Load Speed

6.3 sec in total

First Response

761 ms

Resources Loaded

5.1 sec

Page Rendered

450 ms

About Website

Visit opencollege.kr now to see the best up-to-date Opencollege content for South Korea and also check out these interesting facts you probably never knew about opencollege.kr

오픈컬리지는 다양한 사람들이 자유롭게 지식과 경험을 공유하며 누구나 무엇이든 배울 수 있는 환경을 만들어가는 커뮤니티입니다.

Visit opencollege.kr

Key Findings

We analyzed Opencollege.kr page load time and found that the first response time was 761 ms and then it took 5.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

opencollege.kr performance score

5

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value10.4 s

0/100

10%

LCP (Largest Contentful Paint)

Value16.5 s

0/100

25%

SI (Speed Index)

Value20.8 s

0/100

10%

TBT (Total Blocking Time)

Value1,760 ms

10/100

30%

CLS (Cumulative Layout Shift)

Value0.561

12/100

15%

TTI (Time to Interactive)

Value27.9 s

0/100

10%

Network Requests Diagram

opencollege.kr

761 ms

www.opencollege.kr

898 ms

application-f25a22aa0c567e8a3d2654bdba11bd89.css

651 ms

application-631193a240866b32589342aac0079b2b.js

2137 ms

about-90ffcb4e2de147ab6d2e6df98e3e17ae.js

573 ms

Our browser made a total of 60 requests to load all elements on the main page. We found that 60% of them (36 requests) were addressed to the original Opencollege.kr, 7% (4 requests) were made to Facebook.com and 7% (4 requests) were made to F.vimeocdn.com. The less responsive or slowest element that took the longest time to load (2.1 sec) belongs to the original domain Opencollege.kr.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.8 MB (24%)

Content Size

7.2 MB

After Optimization

5.5 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Opencollege.kr main page is 7.2 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. 55% of websites need less resources to load. Images take 5.1 MB which makes up the majority of the site volume.

HTML Optimization

-69%

Potential reduce by 32.9 kB

  • Original 47.3 kB
  • After minification 44.6 kB
  • After compression 14.5 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 32.9 kB or 69% of the original size.

Image Optimization

-5%

Potential reduce by 246.6 kB

  • Original 5.1 MB
  • After minification 4.9 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. Opencollege images are well optimized though.

JavaScript Optimization

-69%

Potential reduce by 1.1 MB

  • Original 1.7 MB
  • After minification 1.7 MB
  • After compression 515.3 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 1.1 MB or 69% of the original size.

CSS Optimization

-83%

Potential reduce by 327.6 kB

  • Original 393.8 kB
  • After minification 391.3 kB
  • After compression 66.1 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. Opencollege.kr needs all CSS files to be minified and compressed as it can save up to 327.6 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 11 (21%)

Requests Now

52

After Optimization

41

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 52 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Opencollege. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

opencollege.kr accessibility score

74

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.

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

Links do not have a discernible name

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

opencollege.kr 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

Missing source maps for large first-party JavaScript

SEO Factors

opencollege.kr SEO score

76

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

High

robots.txt is not valid

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

    KO

  • Language Claimed

    KO

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Opencollege.kr can be misinterpreted by Google and other search engines. Our service has detected that Korean is used on the page, and it matches the claimed language. Our system also found out that Opencollege.kr 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 Opencollege. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: