Tools & Wizards About Us
nbclearn.com screenshot

Report Summary

  • 22

    Performance

    Renders faster than
    40% of other websites

  • 84

    Accessibility

    Visual factors better than
    that of 57% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 62

    SEO

    Google-friendlier than
    22% of websites

nbclearn.com

NBC News Learn - YouTube

Page Load Speed

1.3 sec in total

First Response

30 ms

Resources Loaded

1.2 sec

Page Rendered

113 ms

nbclearn.com screenshot

About Website

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

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Key Findings

We analyzed Nbclearn.com page load time and found that the first response time was 30 ms and then it took 1.3 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 25% of websites can load faster.

Performance Metrics

nbclearn.com performance score

22

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.3 s

74/100

10%

LCP (Largest Contentful Paint)

Value15.3 s

0/100

25%

SI (Speed Index)

Value12.3 s

3/100

10%

TBT (Total Blocking Time)

Value4,720 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.074

95/100

15%

TTI (Time to Interactive)

Value20.6 s

2/100

10%

Network Requests Diagram

nbclearn.com

30 ms

learn

804 ms

nbclearn.css

34 ms

components.css

41 ms

jquery-1.8.3.js

48 ms

Our browser made a total of 72 requests to load all elements on the main page. We found that 3% of them (2 requests) were addressed to the original Nbclearn.com, 94% (68 requests) were made to Static.nbclearn.com and 1% (1 request) were made to S7.addthis.com. The less responsive or slowest element that took the longest time to load (804 ms) belongs to the original domain Nbclearn.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.3 MB (42%)

Content Size

3.1 MB

After Optimization

1.8 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Nbclearn.com main page is 3.1 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. 70% of websites need less resources to load. Images take 1.7 MB which makes up the majority of the site volume.

HTML Optimization

-48%

Potential reduce by 421 B

  • Original 873 B
  • After minification 873 B
  • After compression 452 B

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 421 B or 48% of the original size.

Image Optimization

-10%

Potential reduce by 173.0 kB

  • Original 1.7 MB
  • After minification 1.5 MB

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. NBC Learn images are well optimized though.

JavaScript Optimization

-79%

Potential reduce by 1.1 MB

  • Original 1.4 MB
  • After minification 1.0 MB
  • After compression 289.7 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 1.1 MB or 79% of the original size.

CSS Optimization

-86%

Potential reduce by 53.2 kB

  • Original 61.6 kB
  • After minification 44.1 kB
  • After compression 8.4 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. Nbclearn.com needs all CSS files to be minified and compressed as it can save up to 53.2 kB or 86% of the original size.

Requests Breakdown

Number of requests can be reduced by 25 (36%)

Requests Now

70

After Optimization

45

  • Images
  • JavaScript
  • CSS

The browser has sent 70 CSS, Javascripts, AJAX and image requests in order to completely render the main page of NBC Learn. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 16 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

nbclearn.com

nbclearn.com

30 ms

learn

learn

804 ms

nbclearn.css

nbclearn.css

34 ms

components.css

components.css

41 ms

jquery-1.8.3.js

jquery-1.8.3.js

48 ms

jquery-ui.js

jquery-ui.js

64 ms

jquery.validate.min.js

jquery.validate.min.js

39 ms

jquery.tools.tooltip.js

jquery.tools.tooltip.js

41 ms

jquery.form.js

jquery.form.js

43 ms

jquery.readonly.js

jquery.readonly.js

40 ms

jqModal.js

jqModal.js

57 ms

jquery.cycle.all.min.js

jquery.cycle.all.min.js

41 ms

mashup_core.js

mashup_core.js

41 ms

validate_core.js

validate_core.js

54 ms

validate_form.js

validate_form.js

103 ms

jquery.url.packed.js

jquery.url.packed.js

103 ms

swfobject.js

swfobject.js

56 ms

s_code.js

s_code.js

101 ms

nbclearn.js

nbclearn.js

102 ms

addthis_widget.js

addthis_widget.js

119 ms

flash-logo.jpg

flash-logo.jpg

7 ms

border.jpg

border.jpg

7 ms

nbc_learn_logo.jpg

nbc_learn_logo.jpg

4 ms

login_bg.gif

login_bg.gif

6 ms

divider_dotted.jpg

divider_dotted.jpg

4 ms

search-go.jpg

search-go.jpg

6 ms

DL_bg.jpg

DL_bg.jpg

17 ms

DL_arrow_left.png

DL_arrow_left.png

17 ms

innovation_586.jpg

innovation_586.jpg

93 ms

arrow_link_icon.png

arrow_link_icon.png

371 ms

SOI_Marketing_LOGO.jpg

SOI_Marketing_LOGO.jpg

305 ms

Dremz_m.jpg

Dremz_m.jpg

80 ms

NANANOTECHNOLOGY_WEB-586x297.jpg

NANANOTECHNOLOGY_WEB-586x297.jpg

86 ms

NATURE_Marketing.jpg

NATURE_Marketing.jpg

82 ms

r75pj7551_640x480.jpg

r75pj7551_640x480.jpg

83 ms

parent_toolkit-586x297.jpg

parent_toolkit-586x297.jpg

103 ms

DL_arrow_right.png

DL_arrow_right.png

86 ms

dl_control_play.jpg

dl_control_play.jpg

88 ms

dl_control_pause.jpg

dl_control_pause.jpg

94 ms

dl_control_no_selected.jpg

dl_control_no_selected.jpg

84 ms

dl_control_no_selected_over.jpg

dl_control_no_selected_over.jpg

78 ms

DL_free_trial_btn.jpg

DL_free_trial_btn.jpg

99 ms

DL_contact_btn.jpg

DL_contact_btn.jpg

119 ms

fb.jpg

fb.jpg

86 ms

twitter.jpg

twitter.jpg

89 ms

edmodo.jpg

edmodo.jpg

92 ms

gplus.jpg

gplus.jpg

66 ms

instagram.jpg

instagram.jpg

93 ms

content_main_bg.gif

content_main_bg.gif

94 ms

yellow_small_module.jpg

yellow_small_module.jpg

95 ms

rss_icon_over.jpg

rss_icon_over.jpg

99 ms

rss_icon.jpg

rss_icon.jpg

102 ms

newbanner.png

newbanner.png

100 ms

innovation_270x100.jpg

innovation_270x100.jpg

102 ms

whennaturestrikes_270x100.jpg

whennaturestrikes_270x100.jpg

146 ms

mystery_brain_270x100.jpg

mystery_brain_270x100.jpg

107 ms

et99o19248_130x100.jpg

et99o19248_130x100.jpg

161 ms

tk53219244_130x100.jpg

tk53219244_130x100.jpg

147 ms

0oisg18527_130x100.jpg

0oisg18527_130x100.jpg

204 ms

campus_perspectives.jpg

campus_perspectives.jpg

147 ms

yellow_big_module.jpg

yellow_big_module.jpg

151 ms

education_nation_small.jpg

education_nation_small.jpg

149 ms

dotted_line_horizontal.gif

dotted_line_horizontal.gif

152 ms

northforest_311x103.gif

northforest_311x103.gif

154 ms

grcc_311x103.jpg

grcc_311x103.jpg

259 ms

webinar_311x103.jpg

webinar_311x103.jpg

98 ms

dotted_line_vertical.gif

dotted_line_vertical.gif

99 ms

nbc_news_logo.png

nbc_news_logo.png

100 ms

nbc_learn_k12_option.jpg

nbc_learn_k12_option.jpg

99 ms

nbc_learn_highered_option.jpg

nbc_learn_highered_option.jpg

139 ms

nbc_learn_pearson_option.jpg

nbc_learn_pearson_option.jpg

98 ms

s54054988599382

s54054988599382

55 ms

Accessibility Review

nbclearn.com accessibility score

84

Accessibility Issues

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-*] attributes do not match their roles

High

[role]s are not contained by their required parent element

High

ARIA tooltip elements do not have accessible names.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

[id] attributes on active, focusable elements are not unique

Best Practices

nbclearn.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

nbclearn.com SEO score

62

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

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Nbclearn.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Nbclearn.com main page’s claimed encoding is iso-8859-1. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

nbclearn.com

Open Graph description is not detected on the main page of NBC Learn. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: