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    Performance

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    Accessibility

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    Best Practices

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    SEO

nih.gov

National Institutes of Health (NIH) | Turning Discovery Into Health

Page Load Speed

22.3 sec in total

First Response

67 ms

Resources Loaded

12.1 sec

Page Rendered

10.1 sec

nih.gov screenshot

About Website

Visit nih.gov now to see the best up-to-date NIH content for China and also check out these interesting facts you probably never knew about nih.gov

Official website of the National Institutes of Health (NIH). NIH is one of the world's foremost medical research centers. An agency of the U.S. Department of Health and Human Services, the NIH is...

Visit nih.gov

Key Findings

We analyzed Nih.gov page load time and found that the first response time was 67 ms and then it took 22.2 sec to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster.

Performance Metrics

nih.gov performance score

0

Network Requests Diagram

nih.gov

67 ms

www.nih.gov

524 ms

Universal-Federated-Analytics-Min.1.0.js

143 ms

css_mtppzd8_PFstl_yJg9eSCqHm2C-vo2-O3ZRK8QVn30M.css

448 ms

css__mIWP9gcStq74isjZVoAAsiih8VXwJoN75Nyw_BXrj0.css

603 ms

Our browser made a total of 57 requests to load all elements on the main page. We found that 77% of them (44 requests) were addressed to the original Nih.gov, 7% (4 requests) were made to Search.usa.gov and 5% (3 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (4.7 sec) relates to the external source Stats.g.doubleclick.net.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.2 MB (31%)

Content Size

3.9 MB

After Optimization

2.7 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Nih.gov main page is 3.9 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. 55% of websites need less resources to load. Images take 2.3 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 59.9 kB

  • Original 74.1 kB
  • After minification 71.0 kB
  • After compression 14.3 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 59.9 kB or 81% of the original size.

Image Optimization

-2%

Potential reduce by 52.7 kB

  • Original 2.3 MB
  • After minification 2.2 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. NIH images are well optimized though.

JavaScript Optimization

-61%

Potential reduce by 537.4 kB

  • Original 885.1 kB
  • After minification 855.3 kB
  • After compression 347.7 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 537.4 kB or 61% of the original size.

CSS Optimization

-86%

Potential reduce by 540.0 kB

  • Original 629.5 kB
  • After minification 612.5 kB
  • After compression 89.5 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. Nih.gov needs all CSS files to be minified and compressed as it can save up to 540.0 kB or 86% of the original size.

Requests Breakdown

Number of requests can be reduced by 22 (42%)

Requests Now

53

After Optimization

31

  • Images
  • JavaScript
  • CSS

The browser has sent 53 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 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 15 to 1 for JavaScripts and from 9 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

nih.gov

nih.gov

67 ms

www.nih.gov

www.nih.gov

524 ms

Universal-Federated-Analytics-Min.1.0.js

Universal-Federated-Analytics-Min.1.0.js

143 ms

css_mtppzd8_PFstl_yJg9eSCqHm2C-vo2-O3ZRK8QVn30M.css

css_mtppzd8_PFstl_yJg9eSCqHm2C-vo2-O3ZRK8QVn30M.css

448 ms

css__mIWP9gcStq74isjZVoAAsiih8VXwJoN75Nyw_BXrj0.css

css__mIWP9gcStq74isjZVoAAsiih8VXwJoN75Nyw_BXrj0.css

603 ms

css_Wu8npAzy16WmnnnWKxpexfgsAryolGGaX6yO3GWA5bU.css

css_Wu8npAzy16WmnnnWKxpexfgsAryolGGaX6yO3GWA5bU.css

603 ms

css

css

1551 ms

mapsjs-ui.css

mapsjs-ui.css

1787 ms

css_oTdMQ9QWtIt933yCG_bKROjEPaHnpw9Ef0Rw7TKOWrs.css

css_oTdMQ9QWtIt933yCG_bKROjEPaHnpw9Ef0Rw7TKOWrs.css

939 ms

css_jKyTtQrFlF1aTLjdf_ArAKmkGGc5ztuREuDrXZtCIQo.css

css_jKyTtQrFlF1aTLjdf_ArAKmkGGc5ztuREuDrXZtCIQo.css

588 ms

css_KviiBystpJcQq4MplcQZvCFxnu9V763f5bPq_AKh4xM.css

css_KviiBystpJcQq4MplcQZvCFxnu9V763f5bPq_AKh4xM.css

1022 ms

jquery.min.js

jquery.min.js

1662 ms

js_cuQFBvOp3WczOaLpgavNCK93tkDjBdrWEBpCWknW2kc.js

js_cuQFBvOp3WczOaLpgavNCK93tkDjBdrWEBpCWknW2kc.js

1022 ms

js_hNnF7a_sbk6nZ2-mOamHzalYND7HBHDLRInsaU93HDk.js

js_hNnF7a_sbk6nZ2-mOamHzalYND7HBHDLRInsaU93HDk.js

1022 ms

js_g1XvbEs2naSX-46eBzsGDimseeP7d0YWT74S_-yjMYU.js

js_g1XvbEs2naSX-46eBzsGDimseeP7d0YWT74S_-yjMYU.js

997 ms

js_KPRiT7FdkrzDSEcEhwGPBnVd3ZKk-QKuSKncD4w_BHA.js

js_KPRiT7FdkrzDSEcEhwGPBnVd3ZKk-QKuSKncD4w_BHA.js

1160 ms

js_7Ukqb3ierdBEL0eowfOKzTkNu-Le97OPm-UqTS5NENU.js

js_7Ukqb3ierdBEL0eowfOKzTkNu-Le97OPm-UqTS5NENU.js

1021 ms

js_5idECjjAo-X5YdkT65CaIiodkWmZlZv-WjSkHlWhoYk.js

js_5idECjjAo-X5YdkT65CaIiodkWmZlZv-WjSkHlWhoYk.js

1527 ms

js_Um_qRLnP8fOzrkjyP_FeCuZh54gm2IzhJHenEGAjCVs.js

js_Um_qRLnP8fOzrkjyP_FeCuZh54gm2IzhJHenEGAjCVs.js

1527 ms

analytics.js

analytics.js

1551 ms

iframe_api

iframe_api

1548 ms

remote.loader.js

remote.loader.js

1547 ms

sayt_loader.js

sayt_loader.js

2297 ms

collect

collect

206 ms

www-widgetapi.js

www-widgetapi.js

1334 ms

collect

collect

1077 ms

icons-s44521854e4.png

icons-s44521854e4.png

794 ms

nih-logo-color.png

nih-logo-color.png

161 ms

slide-coping-with-traumatic-events.jpg

slide-coping-with-traumatic-events.jpg

234 ms

slide-research-festival-2017.jpg

slide-research-festival-2017.jpg

1274 ms

slide-lrp-2017.jpg

slide-lrp-2017.jpg

233 ms

golden-mitochondria.jpg

golden-mitochondria.jpg

1276 ms

20170717-college-drinking.jpg

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197 ms

20170831-water.jpg

20170831-water.jpg

1274 ms

20170830-cancer-free.jpg

20170830-cancer-free.jpg

1242 ms

20180815-zika.jpg

20180815-zika.jpg

1242 ms

20180829-probiotic.jpg

20180829-probiotic.jpg

1242 ms

nih-at-a-glance-whoweare.jpg

nih-at-a-glance-whoweare.jpg

4568 ms

nih-at-a-glance-director.jpg

nih-at-a-glance-director.jpg

1475 ms

nih-at-a-glance-funding.jpg

nih-at-a-glance-funding.jpg

1475 ms

nih-at-a-glance-labs.jpg

nih-at-a-glance-labs.jpg

1411 ms

nih-at-a-glance-training.jpg

nih-at-a-glance-training.jpg

1475 ms

researcher-holding-petri-dish.jpg

researcher-holding-petri-dish.jpg

1409 ms

collect

collect

4670 ms

sayt.css

sayt.css

1284 ms

sayt_loader_libs.js

sayt_loader_libs.js

4547 ms

slide-coping-with-traumatic-events.jpg

slide-coping-with-traumatic-events.jpg

274 ms

slide-research-festival-2017.jpg

slide-research-festival-2017.jpg

333 ms

slide-lrp-2017.jpg

slide-lrp-2017.jpg

333 ms

golden-mitochondria.jpg

golden-mitochondria.jpg

366 ms

20170717-college-drinking.jpg

20170717-college-drinking.jpg

285 ms

20170831-water.jpg

20170831-water.jpg

283 ms

20170830-cancer-free.jpg

20170830-cancer-free.jpg

318 ms

20180815-zika.jpg

20180815-zika.jpg

316 ms

20180829-probiotic.jpg

20180829-probiotic.jpg

317 ms

extlink_s.png

extlink_s.png

317 ms

foresee-surveydef.js

foresee-surveydef.js

505 ms

SEO Factors

nih.gov SEO score

0

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 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 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

nih.gov

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