Analyze 國立交通大學開放式課程(OpenCourseWare, OCW).

國立交通大學開放式課程網站OCW每學期提供10門以上之優質課程,包含各院系基礎、專業課程、共同必修課程及通識教育課程,無償地提供自學者更多元豐富的學習管道。本網站於2012年更從全球超過250個大學開放式課程網站中脫穎而出,百裡選一地獲得全球開放式課程聯盟年度「標竿網站獎」(LandmarkSite Award)。

Page load speed analysis

  • 51/100

    Normal result
  • 6

    Successful tests
  • 2

    Failed tests
  • First response

    1.5 sec

  • Resources loaded

    4.2 sec

  • Page rendered

    209 ms

  • Total page load time

    5.9 sec

Welcome to homepage info - get ready to check OCW Nctu best content for Taiwan right away, or after learning these important things about

We analyzed page load time and found that the first response time was 1.5 sec and then it took 4.4 sec to load all DOM resources and completely render a web page. This is a poor result, as 65% of websites can load faster.

Page optimization

  • HTML 31.1 kB
    Images 429.3 kB
    Javascripts 103.1 kB
    CSS 68.4 kB

    In fact, the total size of main page is 631.9 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. 35% of websites need less resources to load. Images take 429.3 kB which makes up the majority of the site volume.

    • Original 31.1 kB
    • After minification 27.8 kB
    • After compression 7.0 kB

    HTML optimization

    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 3.3 kB, which is 11% 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 24.1 kB or 78% of the original size.

    • Original 429.3 kB
    • After optimization 299.7 kB

    Image optimization

    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, OCW Nctu needs image optimization as it can save up to 129.5 kB or 30% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

    • Original 103.1 kB
    • After minification 86.9 kB
    • After compression 34.5 kB

    JavaScript optimization

    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 68.6 kB or 67% of the original size.

    • Original 68.4 kB
    • After minification 53.3 kB
    • After compression 7.7 kB

    CSS optimization

    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. needs all CSS files to be minified and compressed as it can save up to 60.7 kB or 89% of the original size.

Network requests diagram

  • default.js
  • Header.css
  • style.css
  • page-numbers.css
  • style.css
  • ocw_logo.jpg
  • jquery-1.2.3.pack.js
  • jquery.jcarousel.js
  • jquery.jcarousel.css
  • skin.css
  • search_btn.jpg
  • Nav_01.jpg
  • Nav_02.jpg
  • Nav_03.jpg
  • Nav_04.jpg
  • Nav_05.jpg
  • Nav_06.jpg
  • Nav_07.jpg
  • iimg1601011642107316.JPG
  • iimg140905003444847.jpg
  • iimg140905025295619.jpg
  • iimg1409050230175769.jpg
  • iimg1409050200118512.jpg
  • iimg1403035526174079.jpg
  • iimg14090446123963.jpg
  • iimg140904470648568.jpg
  • layout_r3_c1_s.gif
  • ga.js
  • icon_arrow.gif
  • layout_r5_c2_s.gif
  • layout_r5_c1_s.gif
  • layout_r3_c2_s.gif
  • pfile11412110153147552.jpg
  • pfile2141211052061277.jpg
  • pfile31412112327121319.jpg
  • __utm.gif
  • pfile4141211552870630.jpg
  • layout_r7_c2_s.gif
  • donate_img02-2.jpg
  • donate_img01.jpg
  • donate_img03.png
  • layout_r7_c3_s.gif
  • banner_youtube.jpg
  • 000.png
  • banner_itunes_2.jpg
  • layout_r7_c3_s2.gif
  • icon_cc6_88x31.png
  • a%2B.jpg
  • search_bg.jpg
  • layout_r2_c1_bg.jpg
  • c751e466f782f7e44ef0166ad7342a138af3b41f
  • layout_r2_c1.jpg
  • video_bg.png
  • arrow_left.png
  • arrow_right.png
  • likebox.php
  • FbUd6dZS1Af.css
  • dGJLq38YL-C.css
  • _rx8naC75Dy.js
  • x5F9OMjKyLw.js
  • ICDbTSzjQEg.js
  • TTCre3391I0.js
  • 10300103_10152138331452966_1072608968741305891_n.png
  • wL6VQj7Ab77.png
  • s7jcwEQH7Sx.png
  • I6-MnjEovm5.js
  • vlXaquuXMrr.js
  • Nav_01_hover.jpg
  • Nav_02_hover.jpg
  • Nav_03_hover.jpg
  • Nav_04_hover.jpg
  • Nav_05_hover.jpg
  • Nav_06_hover.jpg
  • Nav_07_hover.jpg

Our browser made a total of 75 requests to load all elements on the main page. We found that 80% of them (60 requests) were addressed to the original, 13% (10 requests) were made to and 3% (2 requests) were made to The less responsive or slowest element that took the longest time to load (1.8 sec) belongs to the original domain

Additional info on


The browser has sent 72 CSS, Javascripts, AJAX and image requests in order to completely render the main page of OCW Nctu. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.











Possible request optimization













Normal result

IP address

This IP address is dedicated to This is the best domain hosting practice .

Normal result

IP Trace

DNS records

Type Host Target/ip TTL Other
A 3600

Language and encoding

Normal result


ZH zh language flag


N/A  language flag





Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise can be misinterpreted by Google and other search engines. Our service has detected that Chinese is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that 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.

HTTPS certificate

SSL Certificate has no SSL certificate. Web browsing can be safer with HTTPS connection, so we suggest that it should be obtained for this site.

Normal result

Visitor World Map

Country of origin for 75.5% of all visits is Taiwan. It’s good for that their server is also located in Taiwan, as that enables the majority of their visitors to benefit from a much faster page load time.

Good result

Poor result

Social Sharing Optimization

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

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