Tools & Wizards About Us
big-blue.cn screenshot

Report Summary

  • 66

    Performance

    Renders faster than
    79% of other websites

  • 57

    Accessibility

    Visual factors better than
    that of 24% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 92

    SEO

    Google-friendlier than
    75% of websites

big-blue.cn

PADI SCUBA Diving Courses, Dive Equipment and Dive Trips - Big Blue SCUBA Diving Shanghai of China

Page Load Speed

36.4 sec in total

First Response

4.3 sec

Resources Loaded

31.8 sec

Page Rendered

274 ms

big-blue.cn screenshot

About Website

Visit big-blue.cn now to see the best up-to-date Big Blue content for United States and also check out these interesting facts you probably never knew about big-blue.cn

Homepage of Big Blue Diving Shanghai,dive trip information, popular diving courses and diving photo video collections.

Visit big-blue.cn

Key Findings

We analyzed Big-blue.cn page load time and found that the first response time was 4.3 sec and then it took 32.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster. Unfortunately, there were 3 request timeouts, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

big-blue.cn performance score

66

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.7 s

59/100

10%

LCP (Largest Contentful Paint)

Value5.2 s

23/100

25%

SI (Speed Index)

Value4.5 s

72/100

10%

TBT (Total Blocking Time)

Value20 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.257

48/100

15%

TTI (Time to Interactive)

Value2.7 s

97/100

10%

Network Requests Diagram

www.big-blue.cn

4270 ms

global.css

904 ms

index.css

925 ms

jquery-1.7.1.min.js

2372 ms

global.js

977 ms

Our browser made a total of 58 requests to load all elements on the main page. We found that 86% of them (50 requests) were addressed to the original Big-blue.cn, 7% (4 requests) were made to Lxbjs.baidu.com and 3% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (20.3 sec) belongs to the original domain Big-blue.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 91.2 kB (30%)

Content Size

302.6 kB

After Optimization

211.4 kB

  • HTML
  • Images
  • JavaScript

In fact, the total size of Big-blue.cn main page is 302.6 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. 20% of websites need less resources to load. Images take 159.5 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 21.9 kB

  • Original 28.1 kB
  • After minification 24.2 kB
  • After compression 6.2 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 3.9 kB, which is 14% 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 21.9 kB or 78% of the original size.

Image Optimization

-4%

Potential reduce by 6.0 kB

  • Original 159.5 kB
  • After minification 153.5 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. Big Blue images are well optimized though.

JavaScript Optimization

-55%

Potential reduce by 63.3 kB

  • Original 115.0 kB
  • After minification 114.1 kB
  • After compression 51.7 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 63.3 kB or 55% of the original size.

Requests Breakdown

Number of requests can be reduced by 14 (26%)

Requests Now

53

After Optimization

39

  • Images
  • JavaScript
  • CSS

The browser has sent 53 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Big Blue. 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 as a result speed up the page load time.

Network Requests Diagram

www.big-blue.cn

www.big-blue.cn

4270 ms

global.css

global.css

904 ms

index.css

index.css

925 ms

jquery-1.7.1.min.js

jquery-1.7.1.min.js

2372 ms

global.js

global.js

977 ms

isRightStr4Email.js

isRightStr4Email.js

988 ms

index.js

index.js

4750 ms

jquery.slides.min.js

jquery.slides.min.js

2024 ms

head_bg.jpg

head_bg.jpg

5898 ms

logo.gif

logo.gif

1016 ms

padi_5star_idc.jpg

padi_5star_idc.jpg

1286 ms

weibo.jpg

weibo.jpg

19760 ms

facebook.png

facebook.png

2389 ms

tripadvisor.png

tripadvisor.png

494 ms

qq.png

qq.png

1492 ms

we_chat.png

we_chat.png

1388 ms

we_chat.jpg

we_chat.jpg

5107 ms

index.jpg

index.jpg

6459 ms

index.jpg

index.jpg

4232 ms

course_zero_to_hero.jpg

course_zero_to_hero.jpg

10224 ms

prepaid_card.jpg

prepaid_card.jpg

5097 ms

022_s.jpg

022_s.jpg

6772 ms

007_s.jpg

007_s.jpg

16680 ms

054_s.jpg

054_s.jpg

7227 ms

009_s.jpg

009_s.jpg

8005 ms

011_s.jpg

011_s.jpg

8974 ms

022_s.jpg

022_s.jpg

11623 ms

001_s.jpg

001_s.jpg

12709 ms

006_s.jpg

006_s.jpg

9474 ms

index.jpg

index.jpg

11835 ms

img.php

img.php

13803 ms

img.php

img.php

13503 ms

img.php

img.php

13608 ms

img.php

img.php

17277 ms

img.php

img.php

15839 ms

img.php

img.php

15261 ms

img.php

img.php

14312 ms

img.php

img.php

15270 ms

commercial.gif

commercial.gif

15737 ms

sideBarLeftLine.gif

sideBarLeftLine.gif

16664 ms

dive_flag.gif

dive_flag.gif

18074 ms

email.gif

email.gif

16212 ms

email_bg_false.gif

email_bg_false.gif

16673 ms

ball_arrow.gif

ball_arrow.gif

19699 ms

ga.js

ga.js

67 ms

h.js

h.js

642 ms

__utm.gif

__utm.gif

54 ms

4.jpg

4.jpg

20264 ms

lxb.js

lxb.js

4416 ms

hm.gif

hm.gif

302 ms

bannerCover.gif

bannerCover.gif

16171 ms

title_bg.gif

title_bg.gif

16347 ms

foot_bg.jpg

foot_bg.jpg

19490 ms

sliders-icon.gif

sliders-icon.gif

16598 ms

log.gif

log.gif

389 ms

_l.js

_l.js

1457 ms

log.gif

log.gif

383 ms

no_image.gif

no_image.gif

5502 ms

Accessibility Review

big-blue.cn accessibility score

57

Accessibility Issues

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

big-blue.cn best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

big-blue.cn SEO score

92

Search Engine Optimization Advices

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

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Big-blue.cn can be misinterpreted by Google and other search engines. Our service has detected that English 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 Big-blue.cn 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

big-blue.cn

Open Graph description is not detected on the main page of Big Blue. 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: