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name

value

score

weighting

FCP (First Contentful Paint)

Value1.1 s

99/100

10%

LCP (Largest Contentful Paint)

Value1.5 s

100/100

25%

SI (Speed Index)

Value1.4 s

100/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.094

91/100

15%

TTI (Time to Interactive)

Value1.1 s

100/100

10%

51in.tk

684 ms

bluemetinfo.css

89 ms

public.js

154 ms

MSClass.js

155 ms

picjs.js

157 ms

Our browser made a total of 86 requests to load all elements on the main page. We found that 65% of them (56 requests) were addressed to the original 51in.tk, 12% (10 requests) were made to V1.jiathis.com and 3% (3 requests) were made to Cnlogo8.com. The less responsive or slowest element that took the longest time to load (6.2 sec) relates to the external source Webmail24.189.cn.

Content Size

253.6 kB

After Optimization

80.6 kB

In fact, the total size of 51in.tk main page is 253.6 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. 30% of websites need less resources to load. CSS take 67.8 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 51.8 kB

Original 64.8 kB
After minification 62.9 kB
After compression 13.0 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. 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 51.8 kB or 80% of the original size.

Image Optimization

-44%

Potential reduce by 25.8 kB

Original 58.8 kB
After minification 33.0 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, 51 In needs image optimization as it can save up to 25.8 kB or 44% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-58%

Potential reduce by 36.4 kB

Original 62.2 kB
After minification 59.1 kB
After compression 25.8 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 36.4 kB or 58% of the original size.

CSS Optimization

-87%

Potential reduce by 59.0 kB

Original 67.8 kB
After minification 60.8 kB
After compression 8.8 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. 51in.tk needs all CSS files to be minified and compressed as it can save up to 59.0 kB or 87% of the original size.

Requests Now

After Optimization

The browser has sent 82 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 51 In. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and as a result speed up the page load time.

Accessibility Issues

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 the interpretation of your content by users in different locales.

High

<html> element does not have a [lang] attribute

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

Image elements do not have [alt] attributes

These items highlight common accessibility best practices.

High

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

Areas of Improvement

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

High

Serves images with low resolution

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

High

Tap targets are not sized appropriately

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 51in.tk 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 51in.tk 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

51in.tk

Open Graph description is not detected on the main page of 51 In. 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

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

51in.tk

bluemetinfo.css

public.js

MSClass.js

picjs.js

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

51in.tk

bluemetinfo.css

public.js

MSClass.js

picjs.js

reset.css

flash5.js

online.js

stat.php

jiathis_r.js

logo-51fanli-home.png

logo.gif

logo_1.png

baidu_jgylogo1.gif

09freemaillogo143.jpg

163logo.gif

1522066.gif

logo_0_0.gif

logo.gif

19681.gif

ding.gif

lang.png

set.gif

add.gif

cont.gif

webmp.gif

1274344236.gif

menu_bg.gif

menu_left.gif

menu_on_left.gif

menu_on_right.gif

menu_line.gif

menu_right.gif

search.gif

jjtp.jpg

hot.gif

1278667053.jpg

1278667326.jpg

1278666802.jpg

1278667235.jpg

1278666678.jpg

1278666584.jpg

1278666385.jpg

1278643638.jpg