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dhds.cdc.gov screenshot

Report Summary

  • 26

    Performance

    Renders faster than
    45% of other websites

  • 95

    Accessibility

    Visual factors better than
    that of 86% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 90

    SEO

    Google-friendlier than
    68% of websites

dhds.cdc.gov

Disability and Health Data System (DHDS) | NCBDDD | CDC

Page Load Speed

1.9 sec in total

First Response

157 ms

Resources Loaded

1.7 sec

Page Rendered

55 ms

dhds.cdc.gov screenshot

About Website

Welcome to dhds.cdc.gov homepage info - get ready to check DHDS CDC best content for United States right away, or after learning these important things about dhds.cdc.gov

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Visit dhds.cdc.gov

Key Findings

We analyzed Dhds.cdc.gov page load time and found that the first response time was 157 ms and then it took 1.7 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

dhds.cdc.gov performance score

26

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.6 s

0/100

10%

LCP (Largest Contentful Paint)

Value9.1 s

1/100

25%

SI (Speed Index)

Value9.0 s

14/100

10%

TBT (Total Blocking Time)

Value670 ms

44/100

30%

CLS (Cumulative Layout Shift)

Value0.222

56/100

15%

TTI (Time to Interactive)

Value9.7 s

29/100

10%

Network Requests Diagram

dhds.cdc.gov

157 ms

bootstrap.css

124 ms

app.min.css

158 ms

docs.min.css

1227 ms

docs.css

985 ms

Our browser made a total of 40 requests to load all elements on the main page. We found that 83% of them (33 requests) were addressed to the original Dhds.cdc.gov, 5% (2 requests) were made to Google-analytics.com and 5% (2 requests) were made to Js.arcgis.com. The less responsive or slowest element that took the longest time to load (1.2 sec) belongs to the original domain Dhds.cdc.gov.

Page Optimization Overview & Recommendations

Page size can be reduced by 674.2 kB (43%)

Content Size

1.6 MB

After Optimization

909.2 kB

  • HTML
  • JavaScript
  • CSS

In fact, the total size of Dhds.cdc.gov main page is 1.6 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. Javascripts take 1.1 MB which makes up the majority of the site volume.

HTML Optimization

-66%

Potential reduce by 94.8 kB

  • Original 143.2 kB
  • After minification 141.7 kB
  • After compression 48.4 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. 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 94.8 kB or 66% of the original size.

JavaScript Optimization

-48%

Potential reduce by 532.7 kB

  • Original 1.1 MB
  • After minification 1.1 MB
  • After compression 584.0 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 532.7 kB or 48% of the original size.

CSS Optimization

-14%

Potential reduce by 46.8 kB

  • Original 323.5 kB
  • After minification 312.8 kB
  • After compression 276.7 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. Dhds.cdc.gov needs all CSS files to be minified and compressed as it can save up to 46.8 kB or 14% of the original size.

Requests Breakdown

Number of requests can be reduced by 34 (89%)

Requests Now

38

After Optimization

4

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 38 CSS, Javascripts, AJAX and image requests in order to completely render the main page of DHDS CDC. 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 19 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

dhds.cdc.gov

dhds.cdc.gov

157 ms

bootstrap.css

bootstrap.css

124 ms

app.min.css

app.min.css

158 ms

docs.min.css

docs.min.css

1227 ms

docs.css

docs.css

985 ms

prism.css

prism.css

197 ms

spectrum.css

spectrum.css

184 ms

jquery.contextMenu.min.css

jquery.contextMenu.min.css

352 ms

rdGridSystem.css

rdGridSystem.css

194 ms

Theme.css

Theme.css

184 ms

template.css

template.css

354 ms

app.css

app.css

327 ms

Shared.CSS.OpenData.css

Shared.CSS.OpenData.css

219 ms

Shared.CSS.TemplateRDV0.css

Shared.CSS.TemplateRDV0.css

239 ms

viewportSize-min.js

viewportSize-min.js

247 ms

Shared.CSS.CDCTeal.css

Shared.CSS.CDCTeal.css

418 ms

DHDS.css

DHDS.css

338 ms

Shared.CSS.accessibleHide.css

Shared.CSS.accessibleHide.css

539 ms

jquery.min.js

jquery.min.js

367 ms

Universal-Federated-Analytics-Min.js

Universal-Federated-Analytics-Min.js

707 ms

rd_custom_interactions.js

rd_custom_interactions.js

701 ms

topic_levels.js

topic_levels.js

428 ms

analytics_cdcgov.js

analytics_cdcgov.js

440 ms

Shared.JScripts.OmnitureInteractions.js

Shared.JScripts.OmnitureInteractions.js

514 ms

rd_search.js

rd_search.js

652 ms

app.fb6914f348ea3d1557754fa96cc7cb4e.css

app.fb6914f348ea3d1557754fa96cc7cb4e.css

546 ms

bootstrap.bundle.min.js

bootstrap.bundle.min.js

554 ms

ab.js

ab.js

562 ms

app.bundle.min.js

app.bundle.min.js

723 ms

foresee-trigger.js

foresee-trigger.js

696 ms

manifest.3ad1d5771e9b13dbdad2.js

manifest.3ad1d5771e9b13dbdad2.js

702 ms

vendor.e831abf895a55a72eb40.js

vendor.e831abf895a55a72eb40.js

1128 ms

app.e5e9301c9c7219cfefc5.js

app.e5e9301c9c7219cfefc5.js

720 ms

js

js

136 ms

analytics.js

analytics.js

14 ms

tundra.css

tundra.css

40 ms

esri.css

esri.css

44 ms

collect

collect

42 ms

qrcode.min.js

qrcode.min.js

46 ms

s23008402716368

s23008402716368

6 ms

Accessibility Review

dhds.cdc.gov accessibility score

95

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.

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Links do not have a discernible name

Best Practices

dhds.cdc.gov best practices score

75

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

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

dhds.cdc.gov SEO score

90

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

robots.txt is not valid

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

    N/A

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Dhds.cdc.gov can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else), while the claimed language is English. Our system also found out that Dhds.cdc.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

dhds.cdc.gov

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