Tools & Wizards About Us
bbs.21ic.com screenshot

Report Summary

  • 56

    Performance

    Renders faster than
    73% of other websites

  • 37

    Accessibility

    Visual factors better than
    that of 18% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 85

    SEO

    Google-friendlier than
    56% of websites

bbs.21ic.com

21ic电子技术开发论坛，电子工程师开源社区

Page Load Speed

31 sec in total

First Response

1.2 sec

Resources Loaded

29.3 sec

Page Rendered

532 ms

bbs.21ic.com screenshot

About Website

Welcome to bbs.21ic.com homepage info - get ready to check Bbs 21 Ic best content for China right away, or after learning these important things about bbs.21ic.com

21ic电子技术论坛2000年成立，数百万电子工程师及行业大牛无私分享电路设计、电子开发设计经验并在线答疑，每日数千发帖，人气火爆！涵盖单片机论坛,嵌入式论坛,电源论坛,电子设计论坛,ARM论坛,DSP论坛,模拟论坛,通信工控,电测仪表等热门技术版块。

Visit bbs.21ic.com

Key Findings

We analyzed Bbs.21ic.com page load time and found that the first response time was 1.2 sec and then it took 29.8 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 16 request timeouts, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

bbs.21ic.com performance score

56

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.3 s

18/100

10%

LCP (Largest Contentful Paint)

Value4.3 s

43/100

25%

SI (Speed Index)

Value12.2 s

3/100

10%

TBT (Total Blocking Time)

Value290 ms

79/100

30%

CLS (Cumulative Layout Shift)

Value0.058

98/100

15%

TTI (Time to Interactive)

Value7.5 s

48/100

10%

Network Requests Diagram

bbs.21ic.com

1190 ms

bbs_index.css

501 ms

style_4_common.css

748 ms

style_4_forum_makeindex.css

504 ms

common.js

510 ms

Our browser made a total of 154 requests to load all elements on the main page. We found that 31% of them (48 requests) were addressed to the original Bbs.21ic.com, 16% (24 requests) were made to Img.21ic.com and 8% (12 requests) were made to Uc2.21ic.com. The less responsive or slowest element that took the longest time to load (20.4 sec) relates to the external source Img.21ic.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.5 MB (61%)

Content Size

2.4 MB

After Optimization

938.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Bbs.21ic.com main page is 2.4 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 50% of websites need less resources to load. Images take 1.8 MB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 117.8 kB

  • Original 138.4 kB
  • After minification 99.1 kB
  • After compression 20.6 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 39.3 kB, which is 28% 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 117.8 kB or 85% of the original size.

Image Optimization

-61%

Potential reduce by 1.1 MB

  • Original 1.8 MB
  • After minification 720.6 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, Bbs 21 Ic needs image optimization as it can save up to 1.1 MB or 61% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-49%

Potential reduce by 166.6 kB

  • Original 337.3 kB
  • After minification 311.9 kB
  • After compression 170.7 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 166.6 kB or 49% of the original size.

CSS Optimization

-79%

Potential reduce by 98.6 kB

  • Original 125.2 kB
  • After minification 117.7 kB
  • After compression 26.6 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. Bbs.21ic.com needs all CSS files to be minified and compressed as it can save up to 98.6 kB or 79% of the original size.

Requests Breakdown

Number of requests can be reduced by 38 (28%)

Requests Now

137

After Optimization

99

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 137 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Bbs 21 Ic. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 26 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

bbs.21ic.com

bbs.21ic.com

1190 ms

bbs_index.css

bbs_index.css

501 ms

style_4_common.css

style_4_common.css

748 ms

style_4_forum_makeindex.css

style_4_forum_makeindex.css

504 ms

common.js

common.js

510 ms

jquery-1.7.2.min.js

jquery-1.7.2.min.js

2446 ms

topbar_bbs.js

topbar_bbs.js

1137 ms

topline.css

topline.css

1138 ms

cs.js

cs.js

1141 ms

slider.js

slider.js

507 ms

marquee.js

marquee.js

509 ms

wb.js

wb.js

9 ms

ping.js

ping.js

619 ms

img_logo13.jpg

img_logo13.jpg

2302 ms

56fb83f8ec52e.jpg

56fb83f8ec52e.jpg

2478 ms

496e7d25292ae52dca5df1d1891cb2fa.png

496e7d25292ae52dca5df1d1891cb2fa.png

2467 ms

6649905bf6c2ed73922d3e50d8ee7fe8.jpg

6649905bf6c2ed73922d3e50d8ee7fe8.jpg

2155 ms

083d92ac756f13bf4789d02b0cf8eb3f.jpg

083d92ac756f13bf4789d02b0cf8eb3f.jpg

1878 ms

1cddeee9c60001b80f3a30280bebe5d8.jpg

1cddeee9c60001b80f3a30280bebe5d8.jpg

1881 ms

099a5d560957db1527291c47bd051523.jpg

099a5d560957db1527291c47bd051523.jpg

2856 ms

ae9056a83eee60bba20100fbfbe272c7.jpg

ae9056a83eee60bba20100fbfbe272c7.jpg

3198 ms

topline_logo.png

topline_logo.png

677 ms

wx.gif

wx.gif

686 ms

logo.jpg

logo.jpg

261 ms

icon_05.jpg

icon_05.jpg

261 ms

img01.jpg

img01.jpg

250 ms

new01.jpg

new01.jpg

1007 ms

new02.jpg

new02.jpg

1279 ms

icon_que.gif

icon_que.gif

258 ms

zong.jpg

zong.jpg

746 ms

qian.jpg

qian.jpg

755 ms

kai.jpg

kai.jpg

519 ms

fei.jpg

fei.jpg

1666 ms

ico_prepayment.gif

ico_prepayment.gif

1342 ms

56ebaa08d720a.jpg

56ebaa08d720a.jpg

4020 ms

56eb9dc0a7393.jpg

56eb9dc0a7393.jpg

3562 ms

56d94a86e47af.jpg

56d94a86e47af.jpg

2864 ms

img_logo06.jpg

img_logo06.jpg

4704 ms

img_logo03.jpg

img_logo03.jpg

2333 ms

img_logo10.jpg

img_logo10.jpg

20194 ms

img_logo04.jpg

img_logo04.jpg

2477 ms

img_logo02.jpg

img_logo02.jpg

6990 ms

img_logo07.jpg

img_logo07.jpg

20193 ms

img_logo12.jpg

img_logo12.jpg

20194 ms

img_logo11.jpg

img_logo11.jpg

20195 ms

img_logo05.jpg

img_logo05.jpg

20194 ms

img_logo09.jpg

img_logo09.jpg

20195 ms

img_logo08.jpg

img_logo08.jpg

20195 ms

48_avatar_small.jpg

48_avatar_small.jpg

791 ms

noavatar_small.gif

noavatar_small.gif

784 ms

noavatar_small.gif

noavatar_small.gif

660 ms

noavatar_small.gif

noavatar_small.gif

658 ms

08_avatar_small.jpg

08_avatar_small.jpg

649 ms

64_avatar_small.jpg

64_avatar_small.jpg

821 ms

72_avatar_small.jpg

72_avatar_small.jpg

1635 ms

72_avatar_small.jpg

72_avatar_small.jpg

575 ms

61_avatar_small.jpg

61_avatar_small.jpg

693 ms

25_avatar_small.jpg

25_avatar_small.jpg

577 ms

20_avatar_small.jpg

20_avatar_small.jpg

641 ms

02_avatar_small.jpg

02_avatar_small.jpg

742 ms

topline_bg.png

topline_bg.png

690 ms

topline.png

topline.png

692 ms

s

s

1298 ms

icon_12.jpg

icon_12.jpg

508 ms

search.png

search.png

278 ms

search.png

search.png

304 ms

s

s

1271 ms

s

s

1264 ms

s

s

1274 ms

s

s

2698 ms

s

s

1287 ms

line_bluearrow.gif

line_bluearrow.gif

287 ms

icon_11a.jpg

icon_11a.jpg

287 ms

icon_11b.jpg

icon_11b.jpg

293 ms

icon_11c.jpg

icon_11c.jpg

507 ms

icon_11.jpg

icon_11.jpg

539 ms

icon_08.jpg

icon_08.jpg

522 ms

s

s

2025 ms

s

s

2035 ms

s

s

2040 ms

icon_notice.jpg

icon_notice.jpg

501 ms

bbs_star.jpg

bbs_star.jpg

505 ms

dot.png

dot.png

683 ms

s

s

2041 ms

s

s

2818 ms

adfshow

adfshow

11613 ms

s

s

2840 ms

adfshow

adfshow

11668 ms

icon_16.jpg

icon_16.jpg

694 ms

icon_17.jpg

icon_17.jpg

726 ms

project_bg.jpg

project_bg.jpg

728 ms

icon_21.jpg

icon_21.jpg

737 ms

icon_10.jpg

icon_10.jpg

742 ms

ind_bo.jpg

ind_bo.jpg

1176 ms

ind_xin.jpg

ind_xin.jpg

892 ms

wx.gif

wx.gif

923 ms

icon_18.jpg

icon_18.jpg

925 ms

button_01.jpg

button_01.jpg

940 ms

toss_12.gif

toss_12.gif

305 ms

OTY1MTc2Ng==.js

OTY1MTc2Ng==.js

608 ms

scrolltop.png

scrolltop.png

920 ms

share.js

share.js

718 ms

hm.js

hm.js

1203 ms

sn.js

sn.js

2336 ms

3.gif

3.gif

20180 ms

banner_650x60.jpg

banner_650x60.jpg

19456 ms

468x60.gif

468x60.gif

20178 ms

bbs.gif

bbs.gif

20173 ms

346x270.jpg

346x270.jpg

20156 ms

hm.gif

hm.gif

337 ms

LV468-60.gif

LV468-60.gif

20379 ms

banner468.gif

banner468.gif

20369 ms

260x70.jpg

260x70.jpg

20364 ms

1.gif

1.gif

4289 ms

ga.js

ga.js

23 ms

icon_new.gif

icon_new.gif

332 ms

ajax.js

ajax.js

263 ms

loading1.gif

loading1.gif

1188 ms

bundle.js

bundle.js

6 ms

share_api.js

share_api.js

342 ms

share_view.js

share_view.js

691 ms

sn.gif

sn.gif

1301 ms

__utm.gif

__utm.gif

12 ms

client.js

client.js

4 ms

__utm.gif

__utm.gif

3 ms

iframeWidget.js

iframeWidget.js

3 ms

aj_relationship.php

aj_relationship.php

860 ms

aj_relationship.php

aj_relationship.php

852 ms

HVAL-HVL_IMS24633_21IC_BBS_730x60_SC.gif

HVAL-HVL_IMS24633_21IC_BBS_730x60_SC.gif

49 ms

infoline.php

infoline.php

285 ms

tangram.js

tangram.js

2326 ms

api_base.js

api_base.js

577 ms

PSoC-468x60.jpg

PSoC-468x60.jpg

19572 ms

468x60.jpg

468x60.jpg

19544 ms

loading.gif

loading.gif

251 ms

logging.js

logging.js

254 ms

icon_14.jpg

icon_14.jpg

1011 ms

icon_15.jpg

icon_15.jpg

249 ms

qq.jpg

qq.jpg

249 ms

view_base.js

view_base.js

352 ms

followbutton.php

followbutton.php

656 ms

followbutton.php

followbutton.php

702 ms

followButton.css

followButton.css

10 ms

sso.js

sso.js

3 ms

followButton.js

followButton.js

5 ms

suda.js

suda.js

5 ms

b.gif

b.gif

3910 ms

bg_flbtn.png

bg_flbtn.png

3 ms

icon_user.png

icon_user.png

6 ms

b.gif

b.gif

1996 ms

share_style0_16.css

share_style0_16.css

361 ms

logger.js

logger.js

370 ms

seminar.gif

seminar.gif

14134 ms

open_260x70.gif

open_260x70.gif

13499 ms

Accessibility Review

bbs.21ic.com accessibility score

37

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

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

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

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

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

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

bbs.21ic.com best practices score

75

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

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

bbs.21ic.com SEO score

85

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Page is blocked from indexing

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

    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 Bbs.21ic.com 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 Bbs.21ic.com 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

bbs.21ic.com

Open Graph description is not detected on the main page of Bbs 21 Ic. 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: