Tools & Wizards About Us
science.nbcnews.com screenshot

Report Summary

  • 18

    Performance

    Renders faster than
    34% of other websites

  • 84

    Accessibility

    Visual factors better than
    that of 56% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 84

    SEO

    Google-friendlier than
    52% of websites

science.nbcnews.com

Science News: Latest Development and Breakthroughs in Technology, Health, and More | NBC News

Page Load Speed

1.8 sec in total

First Response

49 ms

Resources Loaded

392 ms

Page Rendered

1.3 sec

science.nbcnews.com screenshot

About Website

Click here to check amazing Science NBC News content for United States. Otherwise, check out these important facts you probably never knew about science.nbcnews.com

Find the latest science news articles, photos and videos covering space, the environment, human development and more on NBCNews.com.

Visit science.nbcnews.com

Key Findings

We analyzed Science.nbcnews.com page load time and found that the first response time was 49 ms and then it took 1.7 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.

Performance Metrics

science.nbcnews.com performance score

18

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.9 s

25/100

10%

LCP (Largest Contentful Paint)

Value19.6 s

0/100

25%

SI (Speed Index)

Value19.2 s

0/100

10%

TBT (Total Blocking Time)

Value11,960 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.025

100/100

15%

TTI (Time to Interactive)

Value42.1 s

0/100

10%

Network Requests Diagram

science

49 ms

3359b05c2a2a6fdf.css

83 ms

header.css

90 ms

footer.css

94 ms

8c1255a022da25ee.css

96 ms

Our browser made a total of 83 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Science.nbcnews.com, 33% (27 requests) were made to Media-cldnry.s-nbcnews.com and 1% (1 request) were made to Nbcnews.com. The less responsive or slowest element that took the longest time to load (284 ms) relates to the external source Nodeassets.nbcnews.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 3.1 MB (60%)

Content Size

5.2 MB

After Optimization

2.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Science.nbcnews.com main page is 5.2 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. 80% 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. Javascripts take 2.1 MB which makes up the majority of the site volume.

HTML Optimization

-86%

Potential reduce by 1.0 MB

  • Original 1.2 MB
  • After minification 1.2 MB
  • After compression 161.7 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 1.0 MB or 86% of the original size.

Image Optimization

-1%

Potential reduce by 3.2 kB

  • Original 575.5 kB
  • After minification 572.3 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. Science NBC News images are well optimized though.

JavaScript Optimization

-47%

Potential reduce by 1.0 MB

  • Original 2.1 MB
  • After minification 2.1 MB
  • After compression 1.1 MB

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 1.0 MB or 47% of the original size.

CSS Optimization

-85%

Potential reduce by 1.1 MB

  • Original 1.3 MB
  • After minification 1.3 MB
  • After compression 192.9 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. Science.nbcnews.com needs all CSS files to be minified and compressed as it can save up to 1.1 MB or 85% of the original size.

Requests Breakdown

Number of requests can be reduced by 51 (63%)

Requests Now

81

After Optimization

30

  • Images
  • JavaScript
  • CSS

The browser has sent 81 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Science NBC News. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 40 to 1 for JavaScripts and from 13 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

science

science

49 ms

3359b05c2a2a6fdf.css

3359b05c2a2a6fdf.css

83 ms

header.css

header.css

90 ms

footer.css

footer.css

94 ms

8c1255a022da25ee.css

8c1255a022da25ee.css

96 ms

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18b6ed81931db543.css

94 ms

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96 ms

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100 ms

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108 ms

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104 ms

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104 ms

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141 ms

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111 ms

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149 ms

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145 ms

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144 ms

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144 ms

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145 ms

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33 ms

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26 ms

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14 ms

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Accessibility Review

science.nbcnews.com accessibility score

84

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

Links do not have a discernible name

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

ARIA IDs are not unique

Best Practices

science.nbcnews.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

science.nbcnews.com SEO score

84

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

Links do not have descriptive text

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

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 Science.nbcnews.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 Science.nbcnews.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

science.nbcnews.com

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