Report Summary

  • 25

    Performance

    Renders faster than
    45% of other websites

  • 95

    Accessibility

    Visual factors better than
    that of 87% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 98

    SEO

    Google-friendlier than
    92% of websites

d1w9csuen3k837.cloudfront.net

Chemistry news, research and opinions | Chemistry World

Page Load Speed

5 sec in total

First Response

785 ms

Resources Loaded

3.5 sec

Page Rendered

769 ms

d1w9csuen3k837.cloudfront.net screenshot

About Website

Visit d1w9csuen3k837.cloudfront.net now to see the best up-to-date D 1 W 9 Csuen 3 K 837 Cloudfront content for United States and also check out these interesting facts you probably never knew about d1w9csuen3k837.cloudfront.net

Chemistry, covered. Science news, research, reviews, features and opinions. Read Chemistry World to keep up with stories from across the chemical sciences.

Visit d1w9csuen3k837.cloudfront.net

Key Findings

We analyzed D1w9csuen3k837.cloudfront.net page load time and found that the first response time was 785 ms and then it took 4.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 65% of websites can load faster.

Performance Metrics

d1w9csuen3k837.cloudfront.net performance score

25

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.9 s

26/100

10%

LCP (Largest Contentful Paint)

Value5.8 s

15/100

25%

SI (Speed Index)

Value7.8 s

24/100

10%

TBT (Total Blocking Time)

Value2,790 ms

3/100

30%

CLS (Cumulative Layout Shift)

Value0.056

98/100

15%

TTI (Time to Interactive)

Value17.3 s

4/100

10%

Network Requests Diagram

www.chemistryworld.com

785 ms

OtAutoBlock.js

184 ms

otSDKStub.js

265 ms

core.css

281 ms

jquery.min.js

185 ms

Our browser made a total of 21 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original D1w9csuen3k837.cloudfront.net, 14% (3 requests) were made to Cdn-ukwest.onetrust.com and 14% (3 requests) were made to D2cbg94ubxgsnp.cloudfront.net. The less responsive or slowest element that took the longest time to load (909 ms) relates to the external source Chemistryworld.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 353.5 kB (55%)

Content Size

646.0 kB

After Optimization

292.4 kB

In fact, the total size of D1w9csuen3k837.cloudfront.net main page is 646.0 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. 55% of websites need less resources to load. HTML takes 295.6 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 235.2 kB

  • Original 295.6 kB
  • After minification 285.6 kB
  • After compression 60.4 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. 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 235.2 kB or 80% of the original size.

Image Optimization

-3%

Potential reduce by 1.0 kB

  • Original 38.0 kB
  • After minification 36.9 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. D 1 W 9 Csuen 3 K 837 Cloudfront images are well optimized though.

JavaScript Optimization

-56%

Potential reduce by 115.6 kB

  • Original 205.6 kB
  • After minification 205.6 kB
  • After compression 89.9 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 115.6 kB or 56% of the original size.

CSS Optimization

-2%

Potential reduce by 1.7 kB

  • Original 106.8 kB
  • After minification 106.8 kB
  • After compression 105.1 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. D1w9csuen3k837.cloudfront.net has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 7 (47%)

Requests Now

15

After Optimization

8

The browser has sent 15 CSS, Javascripts, AJAX and image requests in order to completely render the main page of D 1 W 9 Csuen 3 K 837 Cloudfront. 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 as a result speed up the page load time.

Accessibility Review

d1w9csuen3k837.cloudfront.net accessibility score

95

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

Links do not have a discernible name

Best Practices

d1w9csuen3k837.cloudfront.net best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

d1w9csuen3k837.cloudfront.net SEO score

98

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 D1w9csuen3k837.cloudfront.net 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 D1w9csuen3k837.cloudfront.net 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 D 1 W 9 Csuen 3 K 837 Cloudfront. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: