652 ms in total
18 ms
361 ms
273 ms
Welcome to health.nih.gov homepage info - get ready to check Health NIH best content for China right away, or after learning these important things about health.nih.gov
Find science-based health information on symptoms, diagnosis, treatments, research, clinical trials and more from NIH, the nation’s medical research agency.
Visit health.nih.govWe analyzed Health.nih.gov page load time and found that the first response time was 18 ms and then it took 634 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 10% of websites can load faster.
health.nih.gov performance score
name
value
score
weighting
Value4.8 s
12/100
10%
Value6.7 s
8/100
25%
Value6.9 s
33/100
10%
Value6,010 ms
0/100
30%
Value0.194
63/100
15%
Value12.7 s
13/100
10%
18 ms
17 ms
8 ms
6 ms
7 ms
Our browser made a total of 42 requests to load all elements on the main page. We found that 2% of them (1 request) were addressed to the original Health.nih.gov, 69% (29 requests) were made to Nih.gov and 7% (3 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (186 ms) relates to the external source Google-analytics.com.
Page size can be reduced by 472.4 kB (47%)
996.6 kB
524.2 kB
In fact, the total size of Health.nih.gov main page is 996.6 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. 50% of websites need less resources to load. Images take 389.4 kB which makes up the majority of the site volume.
Potential reduce by 53.3 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 53.3 kB or 79% of the original size.
Potential reduce by 15.3 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. Health NIH images are well optimized though.
Potential reduce by 223.2 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 223.2 kB or 67% of the original size.
Potential reduce by 180.6 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. Health.nih.gov needs all CSS files to be minified and compressed as it can save up to 180.6 kB or 87% of the original size.
Number of requests can be reduced by 18 (49%)
37
19
The browser has sent 37 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Health NIH. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 13 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.
health.nih.gov
18 ms
health-information
17 ms
Universal-Federated-Analytics-Min.1.0.js
8 ms
css__lBHRqiTneYXQbWXdWsGMfpHSdyrVIPzLHm-co7VeqiI__XmbyhD8ETEKZV2KPDLWsdWpFxSumDYs6M8qIOsJdMjI__YQBAgzin-AuF-YJME31dMyKjps-up2mC-3_ZlJv8uTk.css
6 ms
css__YzF-yBm98MNkBKA98MWp0Rm_Pp_3JmJ8M62CLJ8zBuM__-SWHqNV11Y2MD_jeIQ0AiucPkAWPHhTbnak7-DTcz6c__YQBAgzin-AuF-YJME31dMyKjps-up2mC-3_ZlJv8uTk.css
7 ms
css__aSY8pwVXDJlNbA5YeHfylzKn21JL4tMYbBED_-E2Yn8__U8dcpfQMd4tV1Ab5Xgva-o9SCg-cNxrIuUNW3io3Kp4__YQBAgzin-AuF-YJME31dMyKjps-up2mC-3_ZlJv8uTk.css
7 ms
css
34 ms
css__o-Oj6U9IDg-aMQu-E1SpLo3m31o9P8XKGng4-JnC68o__ONEpec78KHUSqIEEVjTZgn3H01RWYHf5o3OemFkos_I__YQBAgzin-AuF-YJME31dMyKjps-up2mC-3_ZlJv8uTk.css
17 ms
css__8JGCDBWMUSQoZ6HGZrcftV3JKFuGXwv4WoiyqzzZpiQ__fqX7XojBp4x9EnWQ2twg3N5ER0_nMgtKYm2aj4S0OiU__YQBAgzin-AuF-YJME31dMyKjps-up2mC-3_ZlJv8uTk.css
14 ms
jquery.min.js
56 ms
js__GMhwqhCklkSVxsQehryIiyQqFdZPGiMnwrhpnBSdfrA__9X_zfrJ6E1ZzK22LYZOK2i7AenioOuup2HI21QMERY8__YQBAgzin-AuF-YJME31dMyKjps-up2mC-3_ZlJv8uTk.js
31 ms
js__2bzbrE24coPm5uj_fnejfHFhxP4MnERSax237TPs4fw__wdkmtCtFoxsHxi9Aw4Chyjrsk2Wq3W8tT0vOabX8lY4__YQBAgzin-AuF-YJME31dMyKjps-up2mC-3_ZlJv8uTk.js
29 ms
js__H3_tt0KMnkWcbF03jtMmcbPY7jbf0PUSFiYFQDJ3fbs__xi1Gq3UMeLhZKLeFCvhYz8ovNLOCns23r6Kr2tl2YzY__YQBAgzin-AuF-YJME31dMyKjps-up2mC-3_ZlJv8uTk.js
28 ms
js__GM3GJPR36rRIz0TRkjC5OQwrioSyN9aoYRivDhCO_AM__qAl84FcCv2jyN22yFGS5Oc85cjd9zKX6p_cFNLGhe-M__YQBAgzin-AuF-YJME31dMyKjps-up2mC-3_ZlJv8uTk.js
29 ms
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30 ms
analytics.js
29 ms
iframe_api
182 ms
remote.loader.js
22 ms
stats.js
146 ms
collect
171 ms
collect
186 ms
icons-s6a62f71116.png
114 ms
nih-logo-color.png
16 ms
health-information.png
19 ms
illustration-man-waking-up.jpg
18 ms
boy-wearing-sports-equipment.jpg
18 ms
illustration-tired-woman-touching-temples.jpg
18 ms
illustration-brain.jpg
18 ms
gut-check-screenshot.jpg
22 ms
newsinhealth-spread-out_0.jpg
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20160315-peanut.jpg
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20160315-prostate.jpg
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20160315-placenta.jpg
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extlink_s.png
21 ms
s-BiyweUPV0v-yRb-cjciMDdSZkkecOE1hvV7ZHvhyU.ttf
41 ms
EFpQQyG9GqCrobXxL-KRMcBaWKZ57bY3RXgXH6dOjZ0.ttf
50 ms
foresee-surveydef.js
20 ms
gut-check-screenshot.jpg
22 ms
newsinhealth-spread-out_0.jpg
17 ms
www-widgetapi.js
29 ms
foresee-dhtml.css
7 ms
collect
55 ms
health.nih.gov accessibility score
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
[id] attributes on active, focusable elements are not unique
Heading elements are not in a sequentially-descending order
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 IDs are not unique
health.nih.gov best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
Page has valid source maps
Issues were logged in the Issues panel in Chrome Devtools
health.nih.gov SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
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
Document uses legible font sizes
Tap targets are not sized appropriately
EN
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Health.nih.gov 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 Health.nih.gov 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.
health.nih.gov
Open Graph data is detected on the main page of Health NIH. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: