1.3 sec in total
30 ms
1.2 sec
113 ms
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Visit nbclearn.comWe 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.
nbclearn.com performance score
name
value
score
weighting
Value2.3 s
74/100
10%
Value15.3 s
0/100
25%
Value12.3 s
3/100
10%
Value4,720 ms
0/100
30%
Value0.074
95/100
15%
Value20.6 s
2/100
10%
30 ms
804 ms
34 ms
41 ms
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 size can be reduced by 1.3 MB (42%)
3.1 MB
1.8 MB
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.
Potential reduce by 421 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.
Potential reduce by 173.0 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. NBC Learn images are well optimized though.
Potential reduce by 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 1.1 MB or 79% of the original size.
Potential reduce by 53.2 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.
Number of requests can be reduced by 25 (36%)
70
45
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.
nbclearn.com
30 ms
learn
804 ms
nbclearn.css
34 ms
components.css
41 ms
jquery-1.8.3.js
48 ms
jquery-ui.js
64 ms
jquery.validate.min.js
39 ms
jquery.tools.tooltip.js
41 ms
jquery.form.js
43 ms
jquery.readonly.js
40 ms
jqModal.js
57 ms
jquery.cycle.all.min.js
41 ms
mashup_core.js
41 ms
validate_core.js
54 ms
validate_form.js
103 ms
jquery.url.packed.js
103 ms
swfobject.js
56 ms
s_code.js
101 ms
nbclearn.js
102 ms
addthis_widget.js
119 ms
flash-logo.jpg
7 ms
border.jpg
7 ms
nbc_learn_logo.jpg
4 ms
login_bg.gif
6 ms
divider_dotted.jpg
4 ms
search-go.jpg
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DL_bg.jpg
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DL_arrow_left.png
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innovation_586.jpg
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arrow_link_icon.png
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SOI_Marketing_LOGO.jpg
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Dremz_m.jpg
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NANANOTECHNOLOGY_WEB-586x297.jpg
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NATURE_Marketing.jpg
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r75pj7551_640x480.jpg
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parent_toolkit-586x297.jpg
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DL_arrow_right.png
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dl_control_play.jpg
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dl_control_pause.jpg
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dl_control_no_selected.jpg
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dl_control_no_selected_over.jpg
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DL_free_trial_btn.jpg
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DL_contact_btn.jpg
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fb.jpg
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twitter.jpg
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edmodo.jpg
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gplus.jpg
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instagram.jpg
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content_main_bg.gif
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yellow_small_module.jpg
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newbanner.png
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innovation_270x100.jpg
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whennaturestrikes_270x100.jpg
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mystery_brain_270x100.jpg
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campus_perspectives.jpg
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education_nation_small.jpg
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dotted_line_horizontal.gif
152 ms
northforest_311x103.gif
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grcc_311x103.jpg
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webinar_311x103.jpg
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dotted_line_vertical.gif
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nbc_news_logo.png
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nbc_learn_k12_option.jpg
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nbc_learn_highered_option.jpg
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nbc_learn_pearson_option.jpg
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nbclearn.com accessibility score
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
[aria-*] attributes do not match their roles
[role]s are not contained by their required parent element
ARIA tooltip elements do not have accessible names.
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
[id] attributes on active, focusable elements are not unique
nbclearn.com best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
Missing source maps for large first-party JavaScript
nbclearn.com SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
EN
N/A
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.
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: