Tools & Wizards About Us
health.nih.gov screenshot

Report Summary

  • 50

    Performance

    Renders faster than
    68% of other websites

  • 89

    Accessibility

    Visual factors better than
    that of 71% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 91

    SEO

    Google-friendlier than
    70% of websites

health.nih.gov

Health Information | National Institutes of Health (NIH)

Page Load Speed

826 ms in total

First Response

125 ms

Resources Loaded

530 ms

Page Rendered

171 ms

health.nih.gov screenshot

About Website

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.gov

Key Findings

We analyzed Health.nih.gov page load time and found that the first response time was 125 ms and then it took 701 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.

Performance Metrics

health.nih.gov performance score

50

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.7 s

30/100

10%

LCP (Largest Contentful Paint)

Value6.0 s

13/100

25%

SI (Speed Index)

Value3.8 s

84/100

10%

TBT (Total Blocking Time)

Value480 ms

59/100

30%

CLS (Cumulative Layout Shift)

Value0.003

100/100

15%

TTI (Time to Interactive)

Value9.4 s

30/100

10%

Network Requests Diagram

health.nih.gov

125 ms

health-information

79 ms

remote.loader.js

58 ms

css_PfvPCWanzn7FjDwZqwAHhPoOxYKwkQP-RZSK1pFFG0s.css

45 ms

css__mIWP9gcStq74isjZVoAAsiih8VXwJoN75Nyw_BXrj0.css

28 ms

Our browser made a total of 46 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, 63% (29 requests) were made to Nih.gov and 9% (4 requests) were made to Search.usa.gov. The less responsive or slowest element that took the longest time to load (157 ms) relates to the external source Googletagmanager.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 208.2 kB (28%)

Content Size

739.1 kB

After Optimization

530.9 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Health.nih.gov main page is 739.1 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. Images take 407.2 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 47.6 kB

  • Original 61.1 kB
  • After minification 57.4 kB
  • After compression 13.5 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 47.6 kB or 78% of the original size.

Image Optimization

-13%

Potential reduce by 51.5 kB

  • Original 407.2 kB
  • After minification 355.8 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. Obviously, Health NIH needs image optimization as it can save up to 51.5 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-45%

Potential reduce by 107.4 kB

  • Original 237.8 kB
  • After minification 213.3 kB
  • After compression 130.4 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 107.4 kB or 45% of the original size.

CSS Optimization

-5%

Potential reduce by 1.7 kB

  • Original 32.9 kB
  • After minification 32.9 kB
  • After compression 31.2 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. Health.nih.gov has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 24 (56%)

Requests Now

43

After Optimization

19

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 43 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 17 to 1 for JavaScripts and from 9 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

health.nih.gov

health.nih.gov

125 ms

health-information

health-information

79 ms

remote.loader.js

remote.loader.js

58 ms

css_PfvPCWanzn7FjDwZqwAHhPoOxYKwkQP-RZSK1pFFG0s.css

css_PfvPCWanzn7FjDwZqwAHhPoOxYKwkQP-RZSK1pFFG0s.css

45 ms

css__mIWP9gcStq74isjZVoAAsiih8VXwJoN75Nyw_BXrj0.css

css__mIWP9gcStq74isjZVoAAsiih8VXwJoN75Nyw_BXrj0.css

28 ms

css_jENQOQqZCRFGZK__DTefxYiXR2RUf03k1ugj3_Vg7vk.css

css_jENQOQqZCRFGZK__DTefxYiXR2RUf03k1ugj3_Vg7vk.css

28 ms

jquery.qtip.min.css

jquery.qtip.min.css

46 ms

css_3yt-b0M1HNJsvKsXwYjh5TEtX2lJGAvJvtmVAfORYZs.css

css_3yt-b0M1HNJsvKsXwYjh5TEtX2lJGAvJvtmVAfORYZs.css

28 ms

css

css

60 ms

css_5rDMv37-JxnNA70cRr_1jlAjVs56DCb8EN4XB2QLl0c.css

css_5rDMv37-JxnNA70cRr_1jlAjVs56DCb8EN4XB2QLl0c.css

29 ms

css_KviiBystpJcQq4MplcQZvCFxnu9V763f5bPq_AKh4xM.css

css_KviiBystpJcQq4MplcQZvCFxnu9V763f5bPq_AKh4xM.css

27 ms

js_mQAv54bz2JVXcwS5QWlz0fVY9Os67zeu9bgNqtlVLPY.js

js_mQAv54bz2JVXcwS5QWlz0fVY9Os67zeu9bgNqtlVLPY.js

43 ms

jquery-2.2.4.min.js

jquery-2.2.4.min.js

45 ms

jquery-migrate-1.4.1.min.js

jquery-migrate-1.4.1.min.js

47 ms

js_9sGTPBGcOGZjLiSLGrYEnuUf8VdvLmL_DEZNNNbnHXk.js

js_9sGTPBGcOGZjLiSLGrYEnuUf8VdvLmL_DEZNNNbnHXk.js

44 ms

js_FdChbDgGNgR9Ikx3vtmbIwf1rY37QVS0Hs4QV_EkGP0.js

js_FdChbDgGNgR9Ikx3vtmbIwf1rY37QVS0Hs4QV_EkGP0.js

44 ms

js_gHk2gWJ_Qw_jU2qRiUmSl7d8oly1Cx7lQFrqcp3RXcI.js

js_gHk2gWJ_Qw_jU2qRiUmSl7d8oly1Cx7lQFrqcp3RXcI.js

43 ms

jquery.qtip.min.js

jquery.qtip.min.js

48 ms

js_vTBTt4FPfAldsLx1jIHh37FrSoycTeqEiMNhmk4LyT8.js

js_vTBTt4FPfAldsLx1jIHh37FrSoycTeqEiMNhmk4LyT8.js

87 ms

2616.js

2616.js

89 ms

js_3s0l7MQ3oYmGkNAypyzCJq3a0wT85XX_P1SLgnph5K4.js

js_3s0l7MQ3oYmGkNAypyzCJq3a0wT85XX_P1SLgnph5K4.js

89 ms

js_7Ukqb3ierdBEL0eowfOKzTkNu-Le97OPm-UqTS5NENU.js

js_7Ukqb3ierdBEL0eowfOKzTkNu-Le97OPm-UqTS5NENU.js

48 ms

js_E9yUYWK8EMydR0HMIp2PahVxPAClXyH0Cnh782A15UM.js

js_E9yUYWK8EMydR0HMIp2PahVxPAClXyH0Cnh782A15UM.js

53 ms

sayt_loader.js

sayt_loader.js

35 ms

gtm.js

gtm.js

157 ms

gateway.min.js

gateway.min.js

126 ms

www.nih.gov.json

www.nih.gov.json

73 ms

icons-s8044ee1c9c.png

icons-s8044ee1c9c.png

47 ms

nih-logo-color.png

nih-logo-color.png

13 ms

health-information.png

health-information.png

47 ms

students-teacher.jpg

students-teacher.jpg

17 ms

woman-whispering.jpg

woman-whispering.jpg

13 ms

active-group.jpg

active-group.jpg

9 ms

woman-peace.jpg

woman-peace.jpg

45 ms

wellness-toolkits-fanned-out.jpg

wellness-toolkits-fanned-out.jpg

92 ms

newsinhealth-spread-out-2.jpg

newsinhealth-spread-out-2.jpg

46 ms

20240514-exercise.jpg

20240514-exercise.jpg

44 ms

20240514-alz.jpg

20240514-alz.jpg

90 ms

20240514-anger.jpg

20240514-anger.jpg

47 ms

wellness-toolkits-fanned-out.jpg

wellness-toolkits-fanned-out.jpg

90 ms

extlink_s.png

extlink_s.png

48 ms

sayt.css

sayt.css

14 ms

sayt_loader_libs.js

sayt_loader_libs.js

14 ms

font

font

46 ms

font

font

47 ms

160d785550611a069284bacf109cfa7c.js

160d785550611a069284bacf109cfa7c.js

47 ms

Accessibility Review

health.nih.gov accessibility score

89

Accessibility Issues

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

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

High

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

High

ARIA IDs are not unique

Best Practices

health.nih.gov best practices score

58

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

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

health.nih.gov SEO score

91

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

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 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.

Social Sharing Optimization

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: