Access ocw.nctu.edu.tw. 國立陽明交通大學開放式課程(OpenCourseWare, OCW).

name

value

score

weighting

FCP (First Contentful Paint)

Value2.8 s

55/100

10%

LCP (Largest Contentful Paint)

Value28.2 s

0/100

25%

SI (Speed Index)

Value12.6 s

3/100

10%

TBT (Total Blocking Time)

Value1,290 ms

18/100

30%

CLS (Cumulative Layout Shift)

Value0.049

99/100

15%

TTI (Time to Interactive)

Value25.0 s

0/100

10%

ocw.nctu.edu.tw

1538 ms

default.js

417 ms

Header.css

422 ms

style.css

1260 ms

page-numbers.css

421 ms

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 Ocw.nctu.edu.tw, 13% (10 requests) were made to Static.xx.fbcdn.net and 3% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (1.8 sec) belongs to the original domain Ocw.nctu.edu.tw.

Content Size

606.0 kB

After Optimization

350.0 kB

In fact, the total size of Ocw.nctu.edu.tw main page is 606.0 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. 35% of websites need less resources to load. Images take 429.3 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 24.1 kB

Original 31.1 kB
After minification 27.8 kB
After compression 7.0 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 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.

Image Optimization

-30%

Potential reduce by 129.5 kB

Original 429.3 kB
After minification 299.7 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, 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.

JavaScript Optimization

-54%

Potential reduce by 41.5 kB

Original 77.2 kB
After minification 61.0 kB
After compression 35.6 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 41.5 kB or 54% of the original size.

CSS Optimization

-89%

Potential reduce by 60.7 kB

Original 68.4 kB
After minification 53.3 kB
After compression 7.7 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. Ocw.nctu.edu.tw needs all CSS files to be minified and compressed as it can save up to 60.7 kB or 89% of the original size.

Requests Now

After Optimization

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.

Accessibility Issues

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.

High

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

These are opportunities to improve keyboard navigation in your application.

High

Heading elements are not in a sequentially-descending order

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

High

Serves images with low resolution

Low

Detected JavaScript libraries

High

Page has valid source maps

Search Engine Optimization Advices

Format your HTML in a way that enables crawlers to better understand your app’s content.

High

Image elements do not have [alt] attributes

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/).

High

Document uses legible font sizes

Language and Encoding

Language Detected

ZH
Language Claimed

N/A
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Ocw.nctu.edu.tw 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 Ocw.nctu.edu.tw 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

ocw.nctu.edu.tw

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:

Report Summary

Performance

Accessibility

Best Practices

SEO

國立陽明交通大學開放式課程(OpenCourseWare, OCW).

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

ocw.nctu.edu.tw

default.js

Header.css

style.css

page-numbers.css

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

ocw.nctu.edu.tw

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

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