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

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...

Page load speed analysis

  • 56/100

    Normal result
  • 7

    Successful tests
  • 1

    Failed test
  • First response

    67 ms

  • Resources loaded

    12.1 sec

  • Page rendered

    10.1 sec

  • Total page load time

    22.3 sec

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

We analyzed 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 a poor result, as 95% of websites can load faster.

Page optimization

  • HTML 74.1 kB
    Images 2.3 MB
    Javascripts 1.0 MB
    CSS 647.5 kB

    In fact, the total size of main page is 4.0 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. 60% of websites need less resources to load. Images take 2.3 MB which makes up the majority of the site volume.

    • Original 74.1 kB
    • After minification 71.0 kB
    • After compression 14.3 kB

    HTML optimization

    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.

    • Original 2.3 MB
    • After optimization 2.2 MB

    Image optimization

    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.

    • Original 1.0 MB
    • After minification 1.0 MB
    • After compression 325.9 kB

    JavaScript optimization

    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 712.4 kB or 69% of the original size.

    • Original 647.5 kB
    • After minification 626.6 kB
    • After compression 89.3 kB

    CSS optimization

    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. needs all CSS files to be minified and compressed as it can save up to 558.2 kB or 86% of the original size.

Network requests diagram

  • Universal-Federated-Analytics-Min.1.0.js
  • css_mtppzd8_PFstl_yJg9eSCqHm2C-vo2-O3ZRK8QVn30M.css
  • css__mIWP9gcStq74isjZVoAAsiih8VXwJoN75Nyw_BXrj0.css
  • css_Wu8npAzy16WmnnnWKxpexfgsAryolGGaX6yO3GWA5bU.css
  • css
  • mapsjs-ui.css
  • css_oTdMQ9QWtIt933yCG_bKROjEPaHnpw9Ef0Rw7TKOWrs.css
  • css_jKyTtQrFlF1aTLjdf_ArAKmkGGc5ztuREuDrXZtCIQo.css
  • css_KviiBystpJcQq4MplcQZvCFxnu9V763f5bPq_AKh4xM.css
  • jquery.min.js
  • js_cuQFBvOp3WczOaLpgavNCK93tkDjBdrWEBpCWknW2kc.js
  • js_hNnF7a_sbk6nZ2-mOamHzalYND7HBHDLRInsaU93HDk.js
  • js_g1XvbEs2naSX-46eBzsGDimseeP7d0YWT74S_-yjMYU.js
  • js_KPRiT7FdkrzDSEcEhwGPBnVd3ZKk-QKuSKncD4w_BHA.js
  • js_7Ukqb3ierdBEL0eowfOKzTkNu-Le97OPm-UqTS5NENU.js
  • js_5idECjjAo-X5YdkT65CaIiodkWmZlZv-WjSkHlWhoYk.js
  • js_Um_qRLnP8fOzrkjyP_FeCuZh54gm2IzhJHenEGAjCVs.js
  • analytics.js
  • iframe_api
  • remote.loader.js
  • sayt_loader.js
  • collect
  • www-widgetapi.js
  • collect
  • icons-s44521854e4.png
  • nih-logo-color.png
  • slide-coping-with-traumatic-events.jpg
  • slide-research-festival-2017.jpg
  • slide-lrp-2017.jpg
  • golden-mitochondria.jpg
  • 20170717-college-drinking.jpg
  • 20170831-water.jpg
  • 20170830-cancer-free.jpg
  • 20180815-zika.jpg
  • 20180829-probiotic.jpg
  • nih-at-a-glance-whoweare.jpg
  • nih-at-a-glance-director.jpg
  • nih-at-a-glance-funding.jpg
  • nih-at-a-glance-labs.jpg
  • nih-at-a-glance-training.jpg
  • researcher-holding-petri-dish.jpg
  • collect
  • sayt.css
  • sayt_loader_libs.js
  • slide-coping-with-traumatic-events.jpg
  • slide-research-festival-2017.jpg
  • slide-lrp-2017.jpg
  • golden-mitochondria.jpg
  • 20170717-college-drinking.jpg
  • 20170831-water.jpg
  • 20170830-cancer-free.jpg
  • 20180815-zika.jpg
  • 20180829-probiotic.jpg
  • extlink_s.png
  • foresee-surveydef.js

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, 7% (4 requests) were made to and 5% (3 requests) were made to The less responsive or slowest element that took the longest time to load (4.7 sec) relates to the external source

Additional info on


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.









Possible request optimization











Normal result


As for redirects, our browser was forwarded to before it reached this domain.

IP address uses IP address which is currently shared with 2 other domains. The more sites share the same IP address, the higher the host server’s workload is. It is strongly recommended that the host server should be changed or the hosting provider should be requested to give a different (separate) IP address for this domain.

Normal result

IP Trace

DNS records

Type Host Target/ip TTL Other
A 300
NS 300
NS 300
NS 300

300 Mname:
Serial: 244658
Refresh: 10800
Retry: 1080
Expire: 2592000
Minimum-ttl: 900

Language and encoding

Good result


EN en language flag


EN en language flag





Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 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 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.

HTTPS certificate

SSL Certificate has no SSL certificate. Web browsing can be safer with HTTPS connection, so we suggest that it should be obtained for this site.

Poor result

Visitor World Map

Country of origin for 36.6% of all visits is United States. It’s good for that their server is also located in United States, as that enables the majority of their visitors to benefit from a much faster page load time.

Good result

Normal result

Social Sharing Optimization

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:

Share this report in social media

Analyze another website