Tools & Wizards About Us

Report Summary

  • 36

    Performance

    Renders faster than
    55% of other websites

  • 80

    Accessibility

    Visual factors better than
    that of 49% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

britannica.com

Encyclopedia Britannica | Britannica

Page Load Speed

2.2 sec in total

First Response

11 ms

Resources Loaded

1.1 sec

Page Rendered

1.1 sec

About Website

Welcome to britannica.com homepage info - get ready to check Britannica best content for United States right away, or after learning these important things about britannica.com

Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts.

Visit britannica.com

Key Findings

We analyzed Britannica.com page load time and found that the first response time was 11 ms and then it took 2.2 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.

Performance Metrics

britannica.com performance score

36

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.9 s

54/100

10%

LCP (Largest Contentful Paint)

Value3.5 s

64/100

25%

SI (Speed Index)

Value15.8 s

0/100

10%

TBT (Total Blocking Time)

Value13,500 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.056

98/100

15%

TTI (Time to Interactive)

Value40.3 s

0/100

10%

Network Requests Diagram

britannica.com

11 ms

www.britannica.com

185 ms

icon

106 ms

vendor-bundle.css

74 ms

mendel-css.css

92 ms

Our browser made a total of 76 requests to load all elements on the main page. We found that 4% of them (3 requests) were addressed to the original Britannica.com, 66% (50 requests) were made to Cdn.britannica.com and 4% (3 requests) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (557 ms) relates to the external source Insitez.blob.core.windows.net.

Page Optimization Overview & Recommendations

Page size can be reduced by 106.3 kB (9%)

Content Size

1.2 MB

After Optimization

1.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Britannica.com main page is 1.2 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. 70% of websites need less resources to load. Images take 738.5 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 102.5 kB

  • Original 128.9 kB
  • After minification 107.4 kB
  • After compression 26.4 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 21.5 kB, which is 17% 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 102.5 kB or 80% of the original size.

Image Optimization

-0%

Potential reduce by 419 B

  • Original 738.5 kB
  • After minification 738.1 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. Britannica images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 339 B

  • Original 258.8 kB
  • After minification 258.8 kB
  • After compression 258.4 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.

CSS Optimization

-5%

Potential reduce by 3.0 kB

  • Original 60.6 kB
  • After minification 60.6 kB
  • After compression 57.6 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. Britannica.com has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 19 (26%)

Requests Now

73

After Optimization

54

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 73 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Britannica. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 17 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

britannica.com accessibility score

80

Accessibility Issues

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

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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.

Best Practices

britannica.com best practices score

83

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

Missing source maps for large first-party JavaScript

SEO Factors

britannica.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

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 Britannica.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 Britannica.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

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