Tools & Wizards About Us
reddsera.com screenshot

Report Summary

  • 64

    Performance

    Renders faster than
    78% of other websites

  • 81

    Accessibility

    Visual factors better than
    that of 52% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 92

    SEO

    Google-friendlier than
    75% of websites

reddsera.com

Reddsera | The Best of Coursera from 2.7 million Reddit upvotes

Page Load Speed

2.1 sec in total

First Response

70 ms

Resources Loaded

754 ms

Page Rendered

1.3 sec

reddsera.com screenshot

About Website

Click here to check amazing Reddsera content. Otherwise, check out these important facts you probably never knew about reddsera.com

The best of Coursera found from analyzing all discussions on Reddit that mention any Coursera course.

Visit reddsera.com

Key Findings

We analyzed Reddsera.com page load time and found that the first response time was 70 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

reddsera.com performance score

64

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.5 s

68/100

10%

LCP (Largest Contentful Paint)

Value5.6 s

17/100

25%

SI (Speed Index)

Value2.5 s

98/100

10%

TBT (Total Blocking Time)

Value350 ms

73/100

30%

CLS (Cumulative Layout Shift)

Value0.037

100/100

15%

TTI (Time to Interactive)

Value5.8 s

67/100

10%

Network Requests Diagram

reddsera.com

70 ms

js

166 ms

bootstrap.min.css

36 ms

css

71 ms

all.min.css

49 ms

Our browser made a total of 104 requests to load all elements on the main page. We found that 6% of them (6 requests) were addressed to the original Reddsera.com, 79% (82 requests) were made to D3njjcbhbojbot.cloudfront.net and 6% (6 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (356 ms) relates to the external source D3njjcbhbojbot.cloudfront.net.

Page Optimization Overview & Recommendations

Page size can be reduced by 232.6 kB (36%)

Content Size

653.9 kB

After Optimization

421.3 kB

  • HTML
  • Images
  • JavaScript

In fact, the total size of Reddsera.com main page is 653.9 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. 50% of websites need less resources to load. Images take 398.9 kB which makes up the majority of the site volume.

HTML Optimization

-92%

Potential reduce by 213.9 kB

  • Original 233.4 kB
  • After minification 199.7 kB
  • After compression 19.5 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 33.7 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 213.9 kB or 92% of the original size.

Image Optimization

-5%

Potential reduce by 18.6 kB

  • Original 398.9 kB
  • After minification 380.3 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. Reddsera images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 67 B

  • Original 21.6 kB
  • After minification 21.6 kB
  • After compression 21.6 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. This website has mostly compressed JavaScripts.

Requests Breakdown

Number of requests can be reduced by 10 (10%)

Requests Now

97

After Optimization

87

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 97 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Reddsera. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

reddsera.com

reddsera.com

70 ms

js

js

166 ms

bootstrap.min.css

bootstrap.min.css

36 ms

css

css

71 ms

all.min.css

all.min.css

49 ms

styles.min.css

styles.min.css

58 ms

jquery.min.js

jquery.min.js

56 ms

email-decode.min.js

email-decode.min.js

51 ms

bootstrap.bundle.min.js

bootstrap.bundle.min.js

51 ms

baguetteBox.min.js

baguetteBox.min.js

62 ms

script.min.js

script.min.js

61 ms

splash-reddsera-best-of-coursera.jpg

splash-reddsera-best-of-coursera.jpg

104 ms

Oakley_reduced.jpg

Oakley_reduced.jpg

102 ms

white-logo.png

white-logo.png

164 ms

AndrewNg-Headshot.jpg

AndrewNg-Headshot.jpg

141 ms

Santos_Headshot_Cropped.jpg

Santos_Headshot_Cropped.jpg

138 ms

Kevin-Wayne.png

Kevin-Wayne.png

139 ms

John-Greiner.jpeg

John-Greiner.jpeg

136 ms

Peng_Roger.jpg

Peng_Roger.jpg

56 ms

500x500_Google.jpg

500x500_Google.jpg

356 ms

brian_bushee.jpg

brian_bushee.jpg

142 ms

Dan-Boneh.jpeg

Dan-Boneh.jpeg

141 ms

landing_roughgarden.png

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144 ms

arvind.jpg

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147 ms

Charles-Severance.jpeg

Charles-Severance.jpeg

146 ms

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148 ms

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149 ms

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151 ms

Ram_Walter_pic.jpg

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154 ms

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151 ms

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152 ms

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Shimon-Schocken-_3_.JPG

155 ms

mcr.JPG

mcr.JPG

156 ms

scott-2014-largeZoomed.jpg

scott-2014-largeZoomed.jpg

157 ms

klingon.png

klingon.png

159 ms

new_headshot_square_color_small.jpg

new_headshot_square_color_small.jpg

158 ms

face.png

face.png

160 ms

Robert-Sedgewick.png

Robert-Sedgewick.png

220 ms

Paul-Gareau.IMG_5705.Smaller-Version-copy.jpg

Paul-Gareau.IMG_5705.Smaller-Version-copy.jpg

213 ms

Erin_Barra.jpg

Erin_Barra.jpg

212 ms

Robert-Wright-by-Barry-Munger.jpg

Robert-Wright-by-Barry-Munger.jpg

215 ms

Mihaela_P_v8.jpg

Mihaela_P_v8.jpg

217 ms

EmilyFox.jpg

EmilyFox.jpg

217 ms

Headshot.jpg

Headshot.jpg

219 ms

web-Katz-.jpg

web-Katz-.jpg

230 ms

Kazdin_headhsot.jpg

Kazdin_headhsot.jpg

220 ms

Gary-Burton.jpeg

Gary-Burton.jpeg

221 ms

Zhai.png

Zhai.png

226 ms

IanHarris.jpg

IanHarris.jpg

224 ms

js

js

120 ms

analytics.js

analytics.js

24 ms

muppala-small.jpg

muppala-small.jpg

313 ms

Dave-Ward.jpeg

Dave-Ward.jpeg

177 ms

collect

collect

92 ms

lm.jpg

lm.jpg

95 ms

Daphne_Koller.png

Daphne_Koller.png

212 ms

Susan.jpg

Susan.jpg

211 ms

magick_PavelPevznerNewest.jpg

magick_PavelPevznerNewest.jpg

211 ms

Headshot.jpg

Headshot.jpg

211 ms

PastedGraphic-1.jpg

PastedGraphic-1.jpg

236 ms

Matthew-O.-Jackson.png

Matthew-O.-Jackson.png

233 ms

aupix-bs-2016.jpg

aupix-bs-2016.jpg

233 ms

photo_2017-10-25_19-30-40.jpg

photo_2017-10-25_19-30-40.jpg

228 ms

econ252_robert_shiller_pic.jpg

econ252_robert_shiller_pic.jpg

206 ms

k_p.jpg

k_p.jpg

229 ms

medward2.jpg

medward2.jpg

229 ms

iyengar_photo.jpg

iyengar_photo.jpg

229 ms

pat.jpg

pat.jpg

227 ms

MW-HEAD.jpg

MW-HEAD.jpg

227 ms

David-Wentzlaff.png

David-Wentzlaff.png

226 ms

page.jpg

page.jpg

262 ms

Lenphoto.jpg

Lenphoto.jpg

262 ms

xavier.jpg

xavier.jpg

261 ms

marclegtuitk.jpg

marclegtuitk.jpg

293 ms

JTUHjIg1_i6t8kCHKm4532VJOt5-QNFgpCtr6Hw5aX8.ttf

JTUHjIg1_i6t8kCHKm4532VJOt5-QNFgpCtr6Hw5aX8.ttf

67 ms

JTUHjIg1_i6t8kCHKm4532VJOt5-QNFgpCu173w5aX8.ttf

JTUHjIg1_i6t8kCHKm4532VJOt5-QNFgpCu173w5aX8.ttf

137 ms

JTUHjIg1_i6t8kCHKm4532VJOt5-QNFgpCuM73w5aX8.ttf

JTUHjIg1_i6t8kCHKm4532VJOt5-QNFgpCuM73w5aX8.ttf

183 ms

JTUFjIg1_i6t8kCHKm459Wx7xQYXK0vOoz6jq6R9WXh0ow.ttf

JTUFjIg1_i6t8kCHKm459Wx7xQYXK0vOoz6jq6R9WXh0ow.ttf

184 ms

JTUFjIg1_i6t8kCHKm459Wx7xQYXK0vOoz6jq3p6WXh0ow.ttf

JTUFjIg1_i6t8kCHKm459Wx7xQYXK0vOoz6jq3p6WXh0ow.ttf

185 ms

JTUFjIg1_i6t8kCHKm459Wx7xQYXK0vOoz6jq0N6WXh0ow.ttf

JTUFjIg1_i6t8kCHKm459Wx7xQYXK0vOoz6jq0N6WXh0ow.ttf

184 ms

188008_noor_lab229-1.jpg

188008_noor_lab229-1.jpg

254 ms

instructor-1-.jpg

instructor-1-.jpg

207 ms

photo-_2_.JPG

photo-_2_.JPG

207 ms

__.jpg

__.jpg

206 ms

Bill-Howe.png

Bill-Howe.png

207 ms

Jennifer-Campbell.jpeg

Jennifer-Campbell.jpeg

207 ms

wadefagen_800px.jpg

wadefagen_800px.jpg

207 ms

NUSinstructor1.jpg

NUSinstructor1.jpg

207 ms

david_archer_bw_4web.jpg

david_archer_bw_4web.jpg

209 ms

me2019.jpg

me2019.jpg

205 ms

Robert_Clark2010v2.jpg

Robert_Clark2010v2.jpg

205 ms

headshot3.jpg

headshot3.jpg

204 ms

I-Chaieb.jpg

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204 ms

nakhleh.jpg

nakhleh.jpg

215 ms

Amber_DSouza.jpg

Amber_DSouza.jpg

219 ms

Matthijs-297x300.jpg

Matthijs-297x300.jpg

102 ms

Paul-Resnick-cropped.jpg

Paul-Resnick-cropped.jpg

95 ms

whiteman-coursera.jpg

whiteman-coursera.jpg

105 ms

wright.jpg

wright.jpg

109 ms

instructor-1-6.jpg

instructor-1-6.jpg

113 ms

Al-Filreis.jpeg

Al-Filreis.jpeg

112 ms

RobertsPhilip2.jpg

RobertsPhilip2.jpg

95 ms

margaretmeloni.jpg

margaretmeloni.jpg

95 ms

Brian-Caffo.jpeg

Brian-Caffo.jpeg

98 ms

Accessibility Review

reddsera.com accessibility score

81

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.

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

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

reddsera.com best practices score

67

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

reddsera.com 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 Reddsera.com 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 Reddsera.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

reddsera.com

Open Graph data is detected on the main page of Reddsera. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: