Tools & Wizards About Us
stem.open.ac.uk screenshot

Report Summary

  • 42

    Performance

    Renders faster than
    61% of other websites

  • 100

    Accessibility

    Visual factors better than
    that of 97% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

stem.open.ac.uk

Faculty of Science, Technology, Engineering & Mathematics

Page Load Speed

2.1 sec in total

First Response

144 ms

Resources Loaded

1.6 sec

Page Rendered

394 ms

stem.open.ac.uk screenshot

About Website

Click here to check amazing Stem Open content for United Kingdom. Otherwise, check out these important facts you probably never knew about stem.open.ac.uk

Faculty of Science, Technology, Engineering and Mathematics at the Open University. We are world leaders in inclusive, innovative and impactful STEM teaching and research.

Visit stem.open.ac.uk

Key Findings

We analyzed Stem.open.ac.uk page load time and found that the first response time was 144 ms and then it took 2 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

stem.open.ac.uk performance score

42

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.7 s

29/100

10%

LCP (Largest Contentful Paint)

Value4.6 s

34/100

25%

SI (Speed Index)

Value4.6 s

71/100

10%

TBT (Total Blocking Time)

Value1,120 ms

23/100

30%

CLS (Cumulative Layout Shift)

Value0.065

97/100

15%

TTI (Time to Interactive)

Value11.0 s

20/100

10%

Network Requests Diagram

stem.open.ac.uk

144 ms

stem.open.ac.uk

358 ms

css_rEI_5cK_B9hB4So2yZUtr5weuEV3heuAllCDE6XsIkI.css

69 ms

css_HuvOPUruGjuDlpeBkV4QObVKw1JOL4REx9rB3qGPBso.css

139 ms

css_7QV6kuKuClX0xHY1VYHyiN7pXj1h6CT5WlgJhQhqbaY.css

206 ms

Our browser made a total of 66 requests to load all elements on the main page. We found that 65% of them (43 requests) were addressed to the original Stem.open.ac.uk, 27% (18 requests) were made to Platform.twitter.com and 3% (2 requests) were made to Syndication.twitter.com. The less responsive or slowest element that took the longest time to load (748 ms) relates to the external source Sgtm.open.ac.uk.

Page Optimization Overview & Recommendations

Page size can be reduced by 113.1 kB (17%)

Content Size

676.3 kB

After Optimization

563.1 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Stem.open.ac.uk main page is 676.3 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. 75% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 491.3 kB which makes up the majority of the site volume.

HTML Optimization

-75%

Potential reduce by 66.8 kB

  • Original 88.6 kB
  • After minification 79.1 kB
  • After compression 21.8 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 9.4 kB, which is 11% 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 66.8 kB or 75% of the original size.

Image Optimization

-7%

Potential reduce by 36.8 kB

  • Original 491.3 kB
  • After minification 454.5 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. Stem Open images are well optimized though.

JavaScript Optimization

-14%

Potential reduce by 9.1 kB

  • Original 63.2 kB
  • After minification 63.2 kB
  • After compression 54.1 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 9.1 kB or 14% of the original size.

CSS Optimization

-1%

Potential reduce by 414 B

  • Original 33.2 kB
  • After minification 33.2 kB
  • After compression 32.8 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. Stem.open.ac.uk has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 35 (56%)

Requests Now

62

After Optimization

27

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 62 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Stem Open. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 24 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

stem.open.ac.uk

stem.open.ac.uk

144 ms

stem.open.ac.uk

stem.open.ac.uk

358 ms

css_rEI_5cK_B9hB4So2yZUtr5weuEV3heuAllCDE6XsIkI.css

css_rEI_5cK_B9hB4So2yZUtr5weuEV3heuAllCDE6XsIkI.css

69 ms

css_HuvOPUruGjuDlpeBkV4QObVKw1JOL4REx9rB3qGPBso.css

css_HuvOPUruGjuDlpeBkV4QObVKw1JOL4REx9rB3qGPBso.css

139 ms

css_7QV6kuKuClX0xHY1VYHyiN7pXj1h6CT5WlgJhQhqbaY.css

css_7QV6kuKuClX0xHY1VYHyiN7pXj1h6CT5WlgJhQhqbaY.css

206 ms

css_WkSj-IvfBw0vgjxQr6C2h_yCbfeH9ml_4de1c4E8J4A.css

css_WkSj-IvfBw0vgjxQr6C2h_yCbfeH9ml_4de1c4E8J4A.css

276 ms

js_6UR8aB1w5-y_vdUUdWDWlX2QhWu_qIXlEGEV48YgV-c.js

js_6UR8aB1w5-y_vdUUdWDWlX2QhWu_qIXlEGEV48YgV-c.js

276 ms

js_gHk2gWJ_Qw_jU2qRiUmSl7d8oly1Cx7lQFrqcp3RXcI.js

js_gHk2gWJ_Qw_jU2qRiUmSl7d8oly1Cx7lQFrqcp3RXcI.js

208 ms

js_V5g6xXD_BFA4P2tYlN34wTmbeXoCfvvUasR4CPITsN0.js

js_V5g6xXD_BFA4P2tYlN34wTmbeXoCfvvUasR4CPITsN0.js

207 ms

221317523.js

221317523.js

34 ms

headerfooter.min.js

headerfooter.min.js

207 ms

headerfooter.css

headerfooter.css

273 ms

cassiecookiewidget.css

cassiecookiewidget.css

329 ms

widgets.js

widgets.js

20 ms

gtm.js

gtm.js

748 ms

loader.js

loader.js

349 ms

OU_Logo_Mobile.svg

OU_Logo_Mobile.svg

89 ms

Accordion_Chevron_Down.svg

Accordion_Chevron_Down.svg

91 ms

Search_Icon_Magnifier.svg

Search_Icon_Magnifier.svg

91 ms

AS_RGB_Bronze-Award.png

AS_RGB_Bronze-Award.png

90 ms

Athena-SWAN-Silver-Award.png

Athena-SWAN-Silver-Award.png

93 ms

iop-juno.jpg

iop-juno.jpg

91 ms

WISE_MEMBER_LOGO_strapline_300dpi.jpg

WISE_MEMBER_LOGO_strapline_300dpi.jpg

272 ms

creative-science.jpg

creative-science.jpg

452 ms

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Nick%2520Braithwaite_crop.jpg

138 ms

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School%20Comp%20ThinkstockPhotos-476085510.jpg

138 ms

Engineering%20and%20Innovation%20ThinkstockPhotos-502918446.jpg

Engineering%20and%20Innovation%20ThinkstockPhotos-502918446.jpg

140 ms

ebv-earth-and-eco-2.jpg

ebv-earth-and-eco-2.jpg

140 ms

life-and-health-sciences.jpg

life-and-health-sciences.jpg

205 ms

mathematics-and-statistics.jpg

mathematics-and-statistics.jpg

205 ms

physical-sciences.jpg

physical-sciences.jpg

212 ms

kmi.jpg

kmi.jpg

212 ms

academic-square.jpg

academic-square.jpg

343 ms

icon-prospectus.png

icon-prospectus.png

274 ms

OU_Crest_SVG.svg

OU_Crest_SVG.svg

455 ms

OU_Crest_SVG_Mobile.svg

OU_Crest_SVG_Mobile.svg

344 ms

stem.open.ac.uk

stem.open.ac.uk

341 ms

Social_facebook.svg

Social_facebook.svg

343 ms

Twitter_X_icon.svg

Twitter_X_icon.svg

453 ms

Social_youtube.svg

Social_youtube.svg

454 ms

Social_linkedin.svg

Social_linkedin.svg

454 ms

OU_Logo.svg

OU_Logo.svg

429 ms

icon-quote-white.svg

icon-quote-white.svg

457 ms

icon-to-top.png

icon-to-top.png

460 ms

widget_iframe.2f70fb173b9000da126c79afe2098f02.html

widget_iframe.2f70fb173b9000da126c79afe2098f02.html

23 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

468 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

533 ms

settings

settings

98 ms

timeline.e108540dddc96e4b707f5cf259a582d7.js

timeline.e108540dddc96e4b707f5cf259a582d7.js

2 ms

ou_stem

ou_stem

153 ms

polyfills-a40ef1678bae11e696dba45124eadd70.js

polyfills-a40ef1678bae11e696dba45124eadd70.js

6 ms

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26 ms

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modules-96ebc7ac3ad66d681a3d.js

29 ms

main-babd9234dc048fb47339.js

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29 ms

_app-a9c9f1a99e4414675fb1.js

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29 ms

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65 ms

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_buildManifest.js

28 ms

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_ssgManifest.js

77 ms

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17 ms

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19 ms

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8 ms

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26 ms

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24 ms

headerfooter-print.css

headerfooter-print.css

70 ms

Accessibility Review

stem.open.ac.uk accessibility score

100

Accessibility Issues

Best Practices

stem.open.ac.uk best practices score

58

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

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

stem.open.ac.uk SEO score

93

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

High

Links are not crawlable

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

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Stem.open.ac.uk 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 Stem.open.ac.uk 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

stem.open.ac.uk

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