Access w3school.com.cn. W3School 在线教程

name

value

score

weighting

FCP (First Contentful Paint)

Value5.6 s

5/100

10%

LCP (Largest Contentful Paint)

Value6.7 s

7/100

25%

SI (Speed Index)

Value7.1 s

32/100

10%

TBT (Total Blocking Time)

Value190 ms

91/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value6.3 s

61/100

10%

w3school.com.cn

734 ms

w3school.com.cn

865 ms

www.w3school.com.cn

726 ms

js

50 ms

c9.css

282 ms

Our browser made a total of 22 requests to load all elements on the main page. We found that 77% of them (17 requests) were addressed to the original W3school.com.cn, 9% (2 requests) were made to Googletagmanager.com and 9% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (1.1 sec) belongs to the original domain W3school.com.cn.

Content Size

221.6 kB

After Optimization

140.5 kB

In fact, the total size of W3school.com.cn main page is 221.6 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. 15% of websites need less resources to load. Images take 147.2 kB which makes up the majority of the site volume.

HTML Optimization

-70%

Potential reduce by 9.7 kB

Original 13.8 kB
After minification 13.7 kB
After compression 4.1 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 9.7 kB or 70% of the original size.

Image Optimization

-26%

Potential reduce by 37.9 kB

Original 147.2 kB
After minification 109.3 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, W3School needs image optimization as it can save up to 37.9 kB or 26% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-60%

Potential reduce by 32.0 kB

Original 52.9 kB
After minification 52.9 kB
After compression 20.9 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 32.0 kB or 60% of the original size.

CSS Optimization

-19%

Potential reduce by 1.5 kB

Original 7.6 kB
After minification 7.6 kB
After compression 6.2 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. W3school.com.cn needs all CSS files to be minified and compressed as it can save up to 1.5 kB or 19% of the original size.

Requests Now

After Optimization

The browser has sent 19 CSS, Javascripts, AJAX and image requests in order to completely render the main page of W3School. According to our analytics all requests are already optimized.