Tools & Wizards About Us
perlego.com screenshot

Report Summary

  • 41

    Performance

    Renders faster than
    60% of other websites

  • 99

    Accessibility

    Visual factors better than
    that of 96% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 99

    SEO

    Google-friendlier than
    93% of websites

perlego.com

Perlego | An online subscription for all your academic books

Page Load Speed

825 ms in total

First Response

44 ms

Resources Loaded

512 ms

Page Rendered

269 ms

perlego.com screenshot

About Website

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

Save up to 90% on textbooks. Read over a million professional and academic ebooks in one simple space.

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Key Findings

We analyzed Perlego.com page load time and found that the first response time was 44 ms and then it took 781 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.

Performance Metrics

perlego.com performance score

41

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.4 s

72/100

10%

LCP (Largest Contentful Paint)

Value3.3 s

70/100

25%

SI (Speed Index)

Value9.0 s

14/100

10%

TBT (Total Blocking Time)

Value3,090 ms

2/100

30%

CLS (Cumulative Layout Shift)

Value0.064

97/100

15%

TTI (Time to Interactive)

Value22.7 s

1/100

10%

Network Requests Diagram

perlego.com

44 ms

perlego.com

41 ms

www.perlego.com

83 ms

4cbc9bbacaeaf923.css

45 ms

polyfills-78c92fac7aa8fdd8.js

62 ms

Our browser made a total of 85 requests to load all elements on the main page. We found that 65% of them (55 requests) were addressed to the original Perlego.com, 34% (29 requests) were made to Img.perlego.com and 1% (1 request) were made to Static.cloudflareinsights.com. The less responsive or slowest element that took the longest time to load (264 ms) belongs to the original domain Perlego.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 200.8 kB (80%)

Content Size

251.2 kB

After Optimization

50.4 kB

  • HTML
  • JavaScript

In fact, the total size of Perlego.com main page is 251.2 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. HTML takes 250.5 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 200.8 kB

  • Original 250.5 kB
  • After minification 250.5 kB
  • After compression 49.8 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. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 200.8 kB or 80% of the original size.

JavaScript Optimization

-3%

Potential reduce by 17 B

  • Original 655 B
  • After minification 655 B
  • After compression 638 B

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 47 (61%)

Requests Now

77

After Optimization

30

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 77 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Perlego. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 48 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

perlego.com

perlego.com

44 ms

perlego.com

perlego.com

41 ms

www.perlego.com

www.perlego.com

83 ms

4cbc9bbacaeaf923.css

4cbc9bbacaeaf923.css

45 ms

polyfills-78c92fac7aa8fdd8.js

polyfills-78c92fac7aa8fdd8.js

62 ms

1443-55c92571889a1101.js

1443-55c92571889a1101.js

59 ms

2010-8b71e2d03e486d50.js

2010-8b71e2d03e486d50.js

61 ms

1429.0c0d657bd364b499.js

1429.0c0d657bd364b499.js

60 ms

706.b97d2721d27aeae7.js

706.b97d2721d27aeae7.js

59 ms

3325.614cb08342ac61b3.js

3325.614cb08342ac61b3.js

68 ms

7482.2b3c8a4d395d728b.js

7482.2b3c8a4d395d728b.js

75 ms

9781.2b6143c45d8c6b85.js

9781.2b6143c45d8c6b85.js

79 ms

9557.354c0ea9ac3e4421.js

9557.354c0ea9ac3e4421.js

77 ms

5038.a13076aaa5d10c1f.js

5038.a13076aaa5d10c1f.js

80 ms

3399.188a71eefe579c4d.js

3399.188a71eefe579c4d.js

80 ms

8104.6c954460f930167f.js

8104.6c954460f930167f.js

91 ms

7920.9c955fc696091fdf.js

7920.9c955fc696091fdf.js

105 ms

3448.d34faa11afde8db6.js

3448.d34faa11afde8db6.js

107 ms

5893.94b0af4de70c93c0.js

5893.94b0af4de70c93c0.js

118 ms

4964.699dec72168605e6.js

4964.699dec72168605e6.js

94 ms

4067.032f479fab2a63bd.js

4067.032f479fab2a63bd.js

109 ms

2828.777069652e505283.js

2828.777069652e505283.js

112 ms

1664.737cfee5f27b7dae.js

1664.737cfee5f27b7dae.js

122 ms

6153.901ea31d503460f1.js

6153.901ea31d503460f1.js

130 ms

4880.aa42be23cd5021b2.js

4880.aa42be23cd5021b2.js

133 ms

8544.3058702926063b47.js

8544.3058702926063b47.js

141 ms

9975.ce17f114992e25bd.js

9975.ce17f114992e25bd.js

135 ms

7180.c7bd7f3318bf720c.js

7180.c7bd7f3318bf720c.js

144 ms

2979.431e4bd5f43806aa.js

2979.431e4bd5f43806aa.js

150 ms

8948.ae55f40c7d5d891c.js

8948.ae55f40c7d5d891c.js

158 ms

9647.73eacb2b09ac74ce.js

9647.73eacb2b09ac74ce.js

160 ms

5746.c5a31ab6154a6b06.js

5746.c5a31ab6154a6b06.js

156 ms

6669.3e949af50e99359a.js

6669.3e949af50e99359a.js

170 ms

8741.02574cf1cb05b450.js

8741.02574cf1cb05b450.js

181 ms

7934.cabe5bfeef1a794d.js

7934.cabe5bfeef1a794d.js

177 ms

6646.1803b14106243cab.js

6646.1803b14106243cab.js

177 ms

2381.251ea4fef373090e.js

2381.251ea4fef373090e.js

206 ms

3287.5e09129122ede0fc.js

3287.5e09129122ede0fc.js

188 ms

architecture-colour.svg

architecture-colour.svg

51 ms

9781631595790_300_450.webp

9781631595790_300_450.webp

73 ms

9780500779378_300_450.webp

9780500779378_300_450.webp

76 ms

9781350055575_300_450.webp

9781350055575_300_450.webp

84 ms

9781350112896_300_450.webp

9781350112896_300_450.webp

81 ms

cambridge-press.webp

cambridge-press.webp

83 ms

taylor-and-francis.webp

taylor-and-francis.webp

82 ms

elsevier.webp

elsevier.webp

97 ms

stanford.webp

stanford.webp

98 ms

wiley.webp

wiley.webp

111 ms

harvard.webp

harvard.webp

110 ms

forbes.webp

forbes.webp

107 ms

bbc.webp

bbc.webp

106 ms

financial-times.webp

financial-times.webp

116 ms

the-guardian.webp

the-guardian.webp

120 ms

la-repubblica.webp

la-repubblica.webp

132 ms

the-times.webp

the-times.webp

135 ms

university-of-liverpool.webp

university-of-liverpool.webp

133 ms

luiss.webp

luiss.webp

129 ms

london-school-of-business.webp

london-school-of-business.webp

137 ms

conde-nast-college.webp

conde-nast-college.webp

139 ms

australian-college-of-theology.webp

australian-college-of-theology.webp

156 ms

people-01.webp

people-01.webp

157 ms

people-02.webp

people-02.webp

181 ms

people-03.webp

people-03.webp

151 ms

people-04.webp

people-04.webp

162 ms

people-05.webp

people-05.webp

164 ms

people-06.webp

people-06.webp

180 ms

people-07.webp

people-07.webp

209 ms

vcd15cbe7772f49c399c6a5babf22c1241717689176015

vcd15cbe7772f49c399c6a5babf22c1241717689176015

47 ms

4944.46295af6d6f8b7a2.js

4944.46295af6d6f8b7a2.js

187 ms

8290.06e1adf4fa3b23f8.js

8290.06e1adf4fa3b23f8.js

144 ms

2619.879bea6284b435e8.js

2619.879bea6284b435e8.js

155 ms

webpack-a40bc083ed589cd5.js

webpack-a40bc083ed589cd5.js

141 ms

framework-cc4c026d0fad6034.js

framework-cc4c026d0fad6034.js

153 ms

main-453a8272cad94867.js

main-453a8272cad94867.js

174 ms

_app-69432541cd37f1f9.js

_app-69432541cd37f1f9.js

165 ms

7058-434709eecfca01e0.js

7058-434709eecfca01e0.js

169 ms

3036-15933a74321cd8d2.js

3036-15933a74321cd8d2.js

164 ms

index-1ec164ee28190f76.js

index-1ec164ee28190f76.js

163 ms

_buildManifest.js

_buildManifest.js

239 ms

_ssgManifest.js

_ssgManifest.js

239 ms

email-decode.min.js

email-decode.min.js

159 ms

image

image

264 ms

image

image

261 ms

noise.webp

noise.webp

215 ms

www.perlego.com

www.perlego.com

30 ms

Accessibility Review

perlego.com accessibility score

99

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

Best Practices

perlego.com best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

perlego.com SEO score

99

Search Engine Optimization Advices

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 Perlego.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 Perlego.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

perlego.com

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