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Report Summary

  • 14

    Performance

    Renders faster than
    26% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 88% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 83

    SEO

    Google-friendlier than
    46% of websites

nlm.nih.gov

National Library of Medicine - National Institutes of Health

Page Load Speed

3.5 sec in total

First Response

64 ms

Resources Loaded

2.8 sec

Page Rendered

666 ms

nlm.nih.gov screenshot

About Website

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

The National Library of Medicine (NLM), on the NIH campus in Bethesda, Maryland, is the world's largest biomedical library and the developer of electronic information services that delivers data to mi...

Visit nlm.nih.gov

Key Findings

We analyzed Nlm.nih.gov page load time and found that the first response time was 64 ms and then it took 3.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.

Performance Metrics

nlm.nih.gov performance score

14

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.2 s

42/100

10%

LCP (Largest Contentful Paint)

Value14.5 s

0/100

25%

SI (Speed Index)

Value4.1 s

80/100

10%

TBT (Total Blocking Time)

Value6,760 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.807

5/100

15%

TTI (Time to Interactive)

Value14.3 s

9/100

10%

Network Requests Diagram

www.nlm.nih.gov

64 ms

css2

49 ms

all.css

52 ms

uswds-init.min.js

67 ms

styles.css

73 ms

Our browser made a total of 77 requests to load all elements on the main page. We found that 53% of them (41 requests) were addressed to the original Nlm.nih.gov, 13% (10 requests) were made to Assets.nlm.nih.gov and 6% (5 requests) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (1.8 sec) relates to the external source Google-analytics.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 72.2 kB (5%)

Content Size

1.4 MB

After Optimization

1.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Nlm.nih.gov main page is 1.4 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. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 986.9 kB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 32.3 kB

  • Original 41.7 kB
  • After minification 36.5 kB
  • After compression 9.4 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. This page needs HTML code to be minified as it can gain 5.3 kB, which is 13% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 32.3 kB or 77% of the original size.

Image Optimization

-1%

Potential reduce by 14.1 kB

  • Original 986.9 kB
  • After minification 972.8 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. Nlm Nih images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 1.0 kB

  • Original 223.3 kB
  • After minification 223.3 kB
  • After compression 222.3 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. This website has mostly compressed JavaScripts.

CSS Optimization

-20%

Potential reduce by 24.7 kB

  • Original 124.2 kB
  • After minification 124.1 kB
  • After compression 99.5 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. Nlm.nih.gov needs all CSS files to be minified and compressed as it can save up to 24.7 kB or 20% of the original size.

Requests Breakdown

Number of requests can be reduced by 32 (46%)

Requests Now

69

After Optimization

37

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 69 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Nlm 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 19 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

www.nlm.nih.gov

www.nlm.nih.gov

64 ms

css2

css2

49 ms

all.css

all.css

52 ms

uswds-init.min.js

uswds-init.min.js

67 ms

styles.css

styles.css

73 ms

uswds.min.js

uswds.min.js

183 ms

jquery.min.js

jquery.min.js

34 ms

jquery-3.3.1.min.js

jquery-3.3.1.min.js

262 ms

nlm_autocomplete.js

nlm_autocomplete.js

64 ms

home_uswds.js

home_uswds.js

42 ms

gtm.js

gtm.js

231 ms

us_flag_small.png

us_flag_small.png

94 ms

expand_more.svg

expand_more.svg

129 ms

icon-dot-gov.svg

icon-dot-gov.svg

132 ms

icon-https.svg

icon-https.svg

129 ms

NLM_White.png

NLM_White.png

131 ms

close.svg

close.svg

143 ms

expand_more.svg

expand_more.svg

105 ms

banner.jpg

banner.jpg

117 ms

icon_pubmed.svg

icon_pubmed.svg

106 ms

icon_medline.svg

icon_medline.svg

126 ms

icon_openi.svg

icon_openi.svg

125 ms

icon_mesh.svg

icon_mesh.svg

144 ms

icons_clinical.svg

icons_clinical.svg

165 ms

icon_blast.svg

icon_blast.svg

162 ms

announce.jpg

announce.jpg

164 ms

Musings_thumbnail_300x270pixels_2.jpg

Musings_thumbnail_300x270pixels_2.jpg

196 ms

insights.png

insights.png

196 ms

circulating.png

circulating.png

193 ms

MedPlusMag_thumbnail_300x270pixels_2.jpg

MedPlusMag_thumbnail_300x270pixels_2.jpg

243 ms

tb.jpg

tb.jpg

244 ms

lib_virtual_tour.jpeg

lib_virtual_tour.jpeg

240 ms

Maia-Hightower.jpg

Maia-Hightower.jpg

241 ms

IRP_home.jpg

IRP_home.jpg

243 ms

IT.jpg

IT.jpg

242 ms

it3.jpg

it3.jpg

244 ms

training3.jpg

training3.jpg

308 ms

history3.jpg

history3.jpg

299 ms

history.jpg

history.jpg

296 ms

StrategicPlan2.jpg

StrategicPlan2.jpg

300 ms

facebook.svg

facebook.svg

301 ms

linkedin.svg

linkedin.svg

297 ms

twitter.svg

twitter.svg

308 ms

youtube.svg

youtube.svg

305 ms

mail.svg

mail.svg

304 ms

KFOmCnqEu92Fr1Me5g.woff

KFOmCnqEu92Fr1Me5g.woff

138 ms

KFOlCnqEu92Fr1MmEU9vAA.woff

KFOlCnqEu92Fr1MmEU9vAA.woff

159 ms

KFOlCnqEu92Fr1MmSU5vAA.woff

KFOlCnqEu92Fr1MmSU5vAA.woff

186 ms

KFOkCnqEu92Fr1MmgWxM.woff

KFOkCnqEu92Fr1MmgWxM.woff

187 ms

KFOlCnqEu92Fr1MmWUlvAA.woff

KFOlCnqEu92Fr1MmWUlvAA.woff

186 ms

fa-solid-900.woff

fa-solid-900.woff

67 ms

fa-regular-400.woff

fa-regular-400.woff

80 ms

jquery-ui.min.js

jquery-ui.min.js

64 ms

jquery-ui.min.css

jquery-ui.min.css

397 ms

nlm-autocomplete.css

nlm-autocomplete.css

400 ms

nlm-autocomplete.min.js

nlm-autocomplete.min.js

309 ms

js

js

51 ms

js

js

242 ms

analytics.js

analytics.js

1761 ms

2050.js

2050.js

1759 ms

Universal-Federated-Analytics-Min.js

Universal-Federated-Analytics-Min.js

229 ms

nlmdirectoryresult.xml

nlmdirectoryresult.xml

1517 ms

infocusresult.xml

infocusresult.xml

1520 ms

ncbiinsightsresult.xml

ncbiinsightsresult.xml

1522 ms

nlmtechnicalbulletinresult.xml

nlmtechnicalbulletinresult.xml

164 ms

circulatingnowresult.xml

circulatingnowresult.xml

168 ms

nlmnewsresult.xml

nlmnewsresult.xml

164 ms

www.nlm.nih.gov.json

www.nlm.nih.gov.json

38 ms

linkid.js

linkid.js

31 ms

js

js

68 ms

js

js

63 ms

Philippine-Nurses-Directory-1941_005624662_feature.jpg

Philippine-Nurses-Directory-1941_005624662_feature.jpg

179 ms

6735f9594d6bb8a4f1fe56c6b3e21cf5.js

6735f9594d6bb8a4f1fe56c6b3e21cf5.js

174 ms

collect

collect

148 ms

collect

collect

138 ms

collect

collect

89 ms

68 ms

Accessibility Review

nlm.nih.gov accessibility score

96

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

nlm.nih.gov best practices score

75

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

Page has valid source maps

SEO Factors

nlm.nih.gov SEO score

83

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Links do not have descriptive text

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 Nlm.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 Nlm.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

nlm.nih.gov

Open Graph description is not detected on the main page of Nlm Nih. 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: