Tools & Wizards About Us
oxygenlevels.org screenshot

Report Summary

  • 31

    Performance

    Renders faster than
    51% of other websites

  • 76

    Accessibility

    Visual factors better than
    that of 42% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 83

    SEO

    Google-friendlier than
    46% of websites

oxygenlevels.org

Historical Global Atmospheric Oxygen Levels Graph & Widget

Page Load Speed

2.9 sec in total

First Response

324 ms

Resources Loaded

2.3 sec

Page Rendered

264 ms

oxygenlevels.org screenshot

About Website

Visit oxygenlevels.org now to see the best up-to-date Oxygen Levels content and also check out these interesting facts you probably never knew about oxygenlevels.org

A free, customizable and sharable interactive graph widget displaying a history of global atmospheric oxygen (O2) levels. A project by the 2 Degrees Institute.

Visit oxygenlevels.org

Key Findings

We analyzed Oxygenlevels.org page load time and found that the first response time was 324 ms and then it took 2.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Performance Metrics

oxygenlevels.org performance score

31

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.4 s

69/100

10%

LCP (Largest Contentful Paint)

Value8.9 s

1/100

25%

SI (Speed Index)

Value8.9 s

15/100

10%

TBT (Total Blocking Time)

Value1,430 ms

15/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value9.3 s

31/100

10%

Network Requests Diagram

oxygenlevels.org

324 ms

purecookie.css%20xxx

96 ms

purecookie.js%20xxx

257 ms

bootstrap.min.css

388 ms

style.css

315 ms

Our browser made a total of 68 requests to load all elements on the main page. We found that 50% of them (34 requests) were addressed to the original Oxygenlevels.org, 13% (9 requests) were made to Climatelevels.org and 9% (6 requests) were made to Google.com. The less responsive or slowest element that took the longest time to load (887 ms) belongs to the original domain Oxygenlevels.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 105.4 kB (10%)

Content Size

1.1 MB

After Optimization

965.8 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Oxygenlevels.org main page is 1.1 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. 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 495.3 kB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 22.6 kB

  • Original 29.4 kB
  • After minification 23.8 kB
  • After compression 6.8 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 5.6 kB, which is 19% 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 22.6 kB or 77% of the original size.

Image Optimization

-4%

Potential reduce by 18.3 kB

  • Original 495.3 kB
  • After minification 477.0 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. Oxygen Levels images are well optimized though.

JavaScript Optimization

-11%

Potential reduce by 49.8 kB

  • Original 470.3 kB
  • After minification 470.2 kB
  • After compression 420.5 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 49.8 kB or 11% of the original size.

CSS Optimization

-19%

Potential reduce by 14.7 kB

  • Original 76.1 kB
  • After minification 76.1 kB
  • After compression 61.4 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. Oxygenlevels.org needs all CSS files to be minified and compressed as it can save up to 14.7 kB or 19% of the original size.

Requests Breakdown

Number of requests can be reduced by 39 (67%)

Requests Now

58

After Optimization

19

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 58 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Oxygen Levels. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 31 to 1 for JavaScripts and from 10 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

oxygenlevels.org

oxygenlevels.org

324 ms

purecookie.css%20xxx

purecookie.css%20xxx

96 ms

purecookie.js%20xxx

purecookie.js%20xxx

257 ms

bootstrap.min.css

bootstrap.min.css

388 ms

style.css

style.css

315 ms

o2.php

o2.php

358 ms

email-decode.min.js

email-decode.min.js

12 ms

api.js

api.js

38 ms

jquery-1.11.3.min.js

jquery-1.11.3.min.js

270 ms

bootstrap.min.js

bootstrap.min.js

324 ms

jquery.backstretch.min.js

jquery.backstretch.min.js

350 ms

device.min.js

device.min.js

490 ms

jquery.mb.YTPlayer.js

jquery.mb.YTPlayer.js

505 ms

featherlight.min.js

featherlight.min.js

553 ms

slick.min.js

slick.min.js

620 ms

jquery.wordrotator.min.js

jquery.wordrotator.min.js

592 ms

jquery.ajaxchimp.js

jquery.ajaxchimp.js

632 ms

jquery.countdown.js

jquery.countdown.js

726 ms

jquery.waypoints.min.js

jquery.waypoints.min.js

768 ms

jquery.counterup.min.js

jquery.counterup.min.js

793 ms

wow.min.js

wow.min.js

847 ms

jquery.fitvids.js

jquery.fitvids.js

862 ms

lj-puppet.js

lj-puppet.js

884 ms

addthis_widget.js

addthis_widget.js

41 ms

bootstrap.css

bootstrap.css

680 ms

css

css

17 ms

font-awesome.min.css

font-awesome.min.css

703 ms

featherlight.css

featherlight.css

721 ms

slick.css

slick.css

776 ms

jquery.wordrotator.css

jquery.wordrotator.css

796 ms

animate.min.css

animate.min.css

887 ms

analytics.js

analytics.js

122 ms

data-icon.png

data-icon.png

278 ms

portrait_pieter_tans.jpg

portrait_pieter_tans.jpg

370 ms

portrait_jeremy_shakun.jpg

portrait_jeremy_shakun.jpg

152 ms

portrait_geoff_dutton.jpg

portrait_geoff_dutton.jpg

388 ms

portrait_blank.png

portrait_blank.png

111 ms

preloader.svg

preloader.svg

249 ms

favicon.ico

favicon.ico

101 ms

graph_grid.png

graph_grid.png

400 ms

o2_station_map.png

o2_station_map.png

220 ms

logo_2degrees.png

logo_2degrees.png

369 ms

jquery.min.js

jquery.min.js

143 ms

analytics.php

analytics.php

389 ms

video.jpg

video.jpg

597 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0B4uaVc.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0B4uaVc.ttf

103 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsgH1x4uaVc.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsgH1x4uaVc.ttf

136 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1x4uaVc.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1x4uaVc.ttf

137 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

456 ms

recaptcha__en.js

recaptcha__en.js

97 ms

collect

collect

70 ms

highcharts.js

highcharts.js

281 ms

js

js

61 ms

anchor

anchor

46 ms

anchor

anchor

70 ms

styles__ltr.css

styles__ltr.css

6 ms

recaptcha__en.js

recaptcha__en.js

32 ms

v77SiQbcxtK1O5ek11TdloiB5zZ00UAxE3PsP-319e4.js

v77SiQbcxtK1O5ek11TdloiB5zZ00UAxE3PsP-319e4.js

57 ms

webworker.js

webworker.js

60 ms

IDLZ5bdCrEGdGR5FKKZfiIWvV7rMSlbAHUEzxUIOBQg.js

IDLZ5bdCrEGdGR5FKKZfiIWvV7rMSlbAHUEzxUIOBQg.js

36 ms

logo_48.png

logo_48.png

30 ms

KFOmCnqEu92Fr1Mu4mxP.ttf

KFOmCnqEu92Fr1Mu4mxP.ttf

73 ms

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

92 ms

KFOlCnqEu92Fr1MmYUtfBBc9.ttf

KFOlCnqEu92Fr1MmYUtfBBc9.ttf

95 ms

collect

collect

56 ms

recaptcha__en.js

recaptcha__en.js

53 ms

exporting.js

exporting.js

245 ms

js

js

48 ms

Accessibility Review

oxygenlevels.org accessibility score

76

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

oxygenlevels.org 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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

oxygenlevels.org SEO score

83

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

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

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Oxygenlevels.org 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 Oxygenlevels.org 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

oxygenlevels.org

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