Tools & Wizards About Us
codehs.com screenshot

Report Summary

  • 16

    Performance

    Renders faster than
    30% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 88% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 80

    SEO

    Google-friendlier than
    42% of websites

codehs.com

CodeHS - Teach Coding and Computer Science at Your School | CodeHS

Page Load Speed

2.9 sec in total

First Response

16 ms

Resources Loaded

1.7 sec

Page Rendered

1.1 sec

codehs.com screenshot

About Website

Visit codehs.com now to see the best up-to-date CodeHS content for United States and also check out these interesting facts you probably never knew about codehs.com

CodeHS is the comprehensive K-12 computer science teaching platform — free curriculum, IDE, grading tools, and professional development for schools and districts nationwide.

Visit codehs.com

Key Findings

We analyzed Codehs.com page load time and found that the first response time was 16 ms and then it took 2.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.

Performance Metrics

codehs.com performance score

16

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.1 s

9/100

10%

LCP (Largest Contentful Paint)

Value40.6 s

0/100

25%

SI (Speed Index)

Value22.3 s

0/100

10%

TBT (Total Blocking Time)

Value5,070 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.014

100/100

15%

TTI (Time to Interactive)

Value45.6 s

0/100

10%

Network Requests Diagram

codehs.com

16 ms

codehs.com

32 ms

9f6f20dc9f.js

93 ms

slick.css

89 ms

compressed.css

104 ms

Our browser made a total of 69 requests to load all elements on the main page. We found that 9% of them (6 requests) were addressed to the original Codehs.com, 59% (41 requests) were made to Static1.codehs.com and 7% (5 requests) were made to Youtube.com. The less responsive or slowest element that took the longest time to load (1.1 sec) relates to the external source Codehsstatic.s3-us-west-2.amazonaws.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 2.2 MB (29%)

Content Size

7.8 MB

After Optimization

5.5 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Codehs.com main page is 7.8 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. Only a small number of websites need less resources to load. Images take 7.2 MB which makes up the majority of the site volume.

HTML Optimization

-72%

Potential reduce by 179.9 kB

  • Original 249.4 kB
  • After minification 219.2 kB
  • After compression 69.5 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 30.2 kB, which is 12% 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 179.9 kB or 72% of the original size.

Image Optimization

-28%

Potential reduce by 2.0 MB

  • Original 7.2 MB
  • After minification 5.2 MB

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, CodeHS needs image optimization as it can save up to 2.0 MB or 28% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-15%

Potential reduce by 35.0 kB

  • Original 227.1 kB
  • After minification 227.1 kB
  • After compression 192.2 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 35.0 kB or 15% of the original size.

CSS Optimization

-0%

Potential reduce by 0 B

  • Original 59.2 kB
  • After minification 59.2 kB
  • After compression 59.2 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. Codehs.com has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 22 (34%)

Requests Now

64

After Optimization

42

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 64 CSS, Javascripts, AJAX and image requests in order to completely render the main page of CodeHS. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 19 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

codehs.com

codehs.com

16 ms

codehs.com

codehs.com

32 ms

9f6f20dc9f.js

9f6f20dc9f.js

93 ms

slick.css

slick.css

89 ms

compressed.css

compressed.css

104 ms

imports.css

imports.css

141 ms

xdy5aym.js

xdy5aym.js

126 ms

webfont.js

webfont.js

97 ms

prism.js

prism.js

103 ms

firebase-app.min.js

firebase-app.min.js

99 ms

firebase-database.min.js

firebase-database.min.js

116 ms

prism-tomorrow-night.css

prism-tomorrow-night.css

98 ms

js

js

424 ms

compressed.js

compressed.js

127 ms

main.js

main.js

425 ms

client

client

132 ms

tableExport.min.js

tableExport.min.js

119 ms

include_by_ajax.js

include_by_ajax.js

115 ms

analytics.js

analytics.js

395 ms

b46469b780f8bb458a1728fc1c2e1497

b46469b780f8bb458a1728fc1c2e1497

418 ms

cover.png

cover.png

1087 ms

dd2d2dc55420a278bb30d6b586d2151a

dd2d2dc55420a278bb30d6b586d2151a

401 ms

VXKG_VtR3Yc

VXKG_VtR3Yc

569 ms

1c27c362eb796d40b7a7793623393a47

1c27c362eb796d40b7a7793623393a47

366 ms

2504e92f961a4cd8c86fe42570d267d8

2504e92f961a4cd8c86fe42570d267d8

370 ms

2b93153958cebd8b80b2887e95138673

2b93153958cebd8b80b2887e95138673

364 ms

brand_logo.png

brand_logo.png

312 ms

codehs_logo_white_text.png

codehs_logo_white_text.png

312 ms

K-12%20Pathways.png

K-12%20Pathways.png

313 ms

Standards.png

Standards.png

313 ms

States.png

States.png

312 ms

Supplemental_materials.png

Supplemental_materials.png

312 ms

java-console.png

java-console.png

332 ms

graphics.png

graphics.png

331 ms

python.png

python.png

332 ms

html.png

html.png

332 ms

karel.png

karel.png

332 ms

editor.png

editor.png

342 ms

activities.png

activities.png

339 ms

intro_cs.png

intro_cs.png

339 ms

micro_bit.png

micro_bit.png

344 ms

intro_python.png

intro_python.png

340 ms

cyber_security.png

cyber_security.png

339 ms

fast_grade.png

fast_grade.png

348 ms

badge_collage.png

badge_collage.png

360 ms

pd.png

pd.png

350 ms

forbes_logo.png

forbes_logo.png

346 ms

usa_today_logo.png

usa_today_logo.png

350 ms

edweek_logo.png

edweek_logo.png

356 ms

edsurge_logo.png

edsurge_logo.png

356 ms

wsj_logo.jpg

wsj_logo.jpg

354 ms

techcrunch_logo.png

techcrunch_logo.png

359 ms

today_logo.png

today_logo.png

358 ms

chevron-left.png

chevron-left.png

362 ms

codehs_logo_dark_text.png

codehs_logo_dark_text.png

364 ms

x_logo.png

x_logo.png

367 ms

threads_logo.png

threads_logo.png

368 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

113 ms

www-player.css

www-player.css

7 ms

www-embed-player.js

www-embed-player.js

32 ms

base.js

base.js

71 ms

ad_status.js

ad_status.js

169 ms

xk0PjXGe3Weoch_wsJrbTmMShFu5SdJ84GkfFnEjZYE.js

xk0PjXGe3Weoch_wsJrbTmMShFu5SdJ84GkfFnEjZYE.js

106 ms

embed.js

embed.js

18 ms

KFOmCnqEu92Fr1Mu4mxM.woff

KFOmCnqEu92Fr1Mu4mxM.woff

40 ms

KFOlCnqEu92Fr1MmEU9fBBc-.woff

KFOlCnqEu92Fr1MmEU9fBBc-.woff

45 ms

id

id

21 ms

Create

Create

134 ms

x13jbr4h

x13jbr4h

246 ms

Accessibility Review

codehs.com accessibility score

96

Accessibility Issues

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

codehs.com 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

High

Missing source maps for large first-party JavaScript

SEO Factors

codehs.com SEO score

80

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

Links do not have descriptive text

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

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Codehs.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Codehs.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

codehs.com

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