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nsf.gov screenshot

Report Summary

  • 45

    Performance

    Renders faster than
    64% of other websites

  • 100

    Accessibility

    Visual factors better than
    that of 97% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 91

    SEO

    Google-friendlier than
    70% of websites

nsf.gov

NSF - National Science Foundation

Page Load Speed

1.9 sec in total

First Response

74 ms

Resources Loaded

945 ms

Page Rendered

836 ms

nsf.gov screenshot

About Website

Click here to check amazing NSF content for United States. Otherwise, check out these important facts you probably never knew about nsf.gov

NSF's mission is to advance the progress of science, a mission accomplished by funding proposals for research and education made by scientists, engineers, and educators from across the country.

Visit nsf.gov

Key Findings

We analyzed Nsf.gov page load time and found that the first response time was 74 ms and then it took 1.8 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.

Performance Metrics

nsf.gov performance score

45

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.6 s

33/100

10%

LCP (Largest Contentful Paint)

Value8.5 s

1/100

25%

SI (Speed Index)

Value4.3 s

76/100

10%

TBT (Total Blocking Time)

Value500 ms

58/100

30%

CLS (Cumulative Layout Shift)

Value0.062

97/100

15%

TTI (Time to Interactive)

Value10.6 s

23/100

10%

Network Requests Diagram

www.nsf.gov

74 ms

gtm.js

126 ms

Universal-Federated-Analytics-Min.js

43 ms

css_lP8a7oyaCJdzkIqofvFpgduZ-5xBBtydWsVkePvBrBo.css

48 ms

css_o5r0ipPKGDTee06ewzoEqQpYwz96eVgVSHU_SPqWI1o.css

125 ms

Our browser made a total of 57 requests to load all elements on the main page. We found that 2% of them (1 request) were addressed to the original Nsf.gov, 49% (28 requests) were made to New.nsf.gov and 25% (14 requests) were made to Nsf-gov-resources.nsf.gov. The less responsive or slowest element that took the longest time to load (594 ms) relates to the external source Nsf-gov-resources.nsf.gov.

Page Optimization Overview & Recommendations

Page size can be reduced by 80.6 kB (10%)

Content Size

847.9 kB

After Optimization

767.3 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Nsf.gov main page is 847.9 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. 75% 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 493.9 kB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 68.5 kB

  • Original 82.4 kB
  • After minification 58.9 kB
  • After compression 13.8 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 23.5 kB, which is 29% 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 68.5 kB or 83% of the original size.

Image Optimization

-2%

Potential reduce by 11.8 kB

  • Original 493.9 kB
  • After minification 482.1 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. NSF images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 170 B

  • Original 160.0 kB
  • After minification 160.0 kB
  • After compression 159.9 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

-0%

Potential reduce by 119 B

  • Original 111.6 kB
  • After minification 111.6 kB
  • After compression 111.4 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. Nsf.gov has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 30 (54%)

Requests Now

56

After Optimization

26

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 56 CSS, Javascripts, AJAX and image requests in order to completely render the main page of NSF. 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 as a result speed up the page load time.

Network Requests Diagram

www.nsf.gov

www.nsf.gov

74 ms

gtm.js

gtm.js

126 ms

Universal-Federated-Analytics-Min.js

Universal-Federated-Analytics-Min.js

43 ms

css_lP8a7oyaCJdzkIqofvFpgduZ-5xBBtydWsVkePvBrBo.css

css_lP8a7oyaCJdzkIqofvFpgduZ-5xBBtydWsVkePvBrBo.css

48 ms

css_o5r0ipPKGDTee06ewzoEqQpYwz96eVgVSHU_SPqWI1o.css

css_o5r0ipPKGDTee06ewzoEqQpYwz96eVgVSHU_SPqWI1o.css

125 ms

5508.js

5508.js

242 ms

us_flag_small.png

us_flag_small.png

61 ms

icon-dot-gov.svg

icon-dot-gov.svg

57 ms

icon-https.svg

icon-https.svg

61 ms

logo-desktop.svg

logo-desktop.svg

63 ms

logo-mobile.svg

logo-mobile.svg

83 ms

close-base-darkest.svg

close-base-darkest.svg

117 ms

Fieldwork_hero.png.webp

Fieldwork_hero.png.webp

337 ms

js_KcgxrapTBjDV3XGuI3plfys4qTojiCN-ojUI2YHIMQ8.js

js_KcgxrapTBjDV3XGuI3plfys4qTojiCN-ojUI2YHIMQ8.js

113 ms

page.js

page.js

109 ms

js_NhGVPCL5VoPHzTBBasLl4lGZapueiU-gdQn1CDEM40I.js

js_NhGVPCL5VoPHzTBBasLl4lGZapueiU-gdQn1CDEM40I.js

202 ms

facebook-icon_square_32x32.png

facebook-icon_square_32x32.png

228 ms

twitter-icon_square_32x32.png

twitter-icon_square_32x32.png

229 ms

instagram-icon_square_32x32.png

instagram-icon_square_32x32.png

228 ms

youtube-icon_square_32x32.png

youtube-icon_square_32x32.png

231 ms

linkedin-icon_square_32x32.png

linkedin-icon_square_32x32.png

248 ms

nsfrss-icon_square_32x32.png

nsfrss-icon_square_32x32.png

230 ms

logo-desktop--white.svg

logo-desktop--white.svg

230 ms

magnifying_glass.svg

magnifying_glass.svg

447 ms

planet.svg

planet.svg

449 ms

superconductor-beta.svg

superconductor-beta.svg

592 ms

plant.svg

plant.svg

457 ms

Dialogue%20of%20regimes_h.png.webp

Dialogue%20of%20regimes_h.png.webp

591 ms

UC_Berkeley_Star_Wars_Hero_Illustration_FINAL.jpg

UC_Berkeley_Star_Wars_Hero_Illustration_FINAL.jpg

456 ms

Panch_Enages_with_attendees_Diverse.jpg

Panch_Enages_with_attendees_Diverse.jpg

456 ms

Rubin-Primary-Tertiary-Mirror.jpg

Rubin-Primary-Tertiary-Mirror.jpg

461 ms

Watercolor%20molecule_580994066%2016x9%20web.jpg

Watercolor%20molecule_580994066%2016x9%20web.jpg

469 ms

Noirlab-img-1657_h.jpg

Noirlab-img-1657_h.jpg

593 ms

PF7015_human_a.jpg

PF7015_human_a.jpg

592 ms

AGEN-Precision%20Ag%20and%20Crop-03-a%20student%20works%20in%20the%20on-campus%20fruit%20orchard.jpg

AGEN-Precision%20Ag%20and%20Crop-03-a%20student%20works%20in%20the%20on-campus%20fruit%20orchard.jpg

594 ms

Voss-NSF002%20uncropped%20Official%20NSF%20Pic_h.JPG

Voss-NSF002%20uncropped%20Official%20NSF%20Pic_h.JPG

591 ms

js

js

299 ms

analytics.js

analytics.js

81 ms

expand_more.svg

expand_more.svg

259 ms

search-primary.svg

search-primary.svg

258 ms

angle-arrow-down-primary.svg

angle-arrow-down-primary.svg

262 ms

facebook-white.svg

facebook-white.svg

258 ms

x-white.svg

x-white.svg

260 ms

instagram-white.svg

instagram-white.svg

259 ms

youtube-white.svg

youtube-white.svg

271 ms

linkedin-white.svg

linkedin-white.svg

271 ms

rss-white.svg

rss-white.svg

274 ms

format_quote-primary.svg

format_quote-primary.svg

269 ms

expand_less-base-darkest.svg

expand_less-base-darkest.svg

267 ms

collect

collect

136 ms

sm.25.html

sm.25.html

138 ms

eso.BRQnzO8v.js

eso.BRQnzO8v.js

173 ms

www.nsf.gov.json

www.nsf.gov.json

135 ms

js

js

156 ms

f0b5f6ee.js

f0b5f6ee.js

469 ms

js

js

120 ms

6735f9594d6bb8a4f1fe56c6b3e21cf5.js

6735f9594d6bb8a4f1fe56c6b3e21cf5.js

38 ms

Accessibility Review

nsf.gov accessibility score

100

Accessibility Issues

Best Practices

nsf.gov best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

nsf.gov SEO score

91

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 Nsf.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 Nsf.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

nsf.gov

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