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Report Summary

  • 87

    Performance

    Renders faster than
    89% of other websites

  • 76

    Accessibility

    Visual factors better than
    that of 42% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 69

    SEO

    Google-friendlier than
    28% of websites

register.clinicaltrials.gov

ClinicalTrials.gov PRS: Login

Page Load Speed

546 ms in total

First Response

107 ms

Resources Loaded

351 ms

Page Rendered

88 ms

register.clinicaltrials.gov screenshot

About Website

Click here to check amazing Register Clinical Trials content for United States. Otherwise, check out these important facts you probably never knew about register.clinicaltrials.gov

Visit register.clinicaltrials.gov

Key Findings

We analyzed Register.clinicaltrials.gov page load time and found that the first response time was 107 ms and then it took 439 ms to load all DOM resources and completely render a web page. This is an excellent result, as only 5% of websites can load faster.

Performance Metrics

register.clinicaltrials.gov performance score

87

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.8 s

90/100

10%

LCP (Largest Contentful Paint)

Value2.1 s

95/100

25%

SI (Speed Index)

Value1.8 s

100/100

10%

TBT (Total Blocking Time)

Value320 ms

77/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value6.4 s

60/100

10%

Network Requests Diagram

register.clinicaltrials.gov

107 ms

register.clinicaltrials.gov

52 ms

Script.js

8 ms

data-entry.css

19 ms

working.js

18 ms

Our browser made a total of 15 requests to load all elements on the main page. We found that 67% of them (10 requests) were addressed to the original Register.clinicaltrials.gov, 13% (2 requests) were made to Google-analytics.com and 7% (1 request) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (107 ms) belongs to the original domain Register.clinicaltrials.gov.

Page Optimization Overview & Recommendations

Page size can be reduced by 40.9 kB (39%)

Content Size

103.6 kB

After Optimization

62.7 kB

  • HTML
  • JavaScript
  • CSS

In fact, the total size of Register.clinicaltrials.gov main page is 103.6 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. 20% of websites need less resources to load. Javascripts take 88.5 kB which makes up the majority of the site volume.

HTML Optimization

-66%

Potential reduce by 4.1 kB

  • Original 6.3 kB
  • After minification 5.5 kB
  • After compression 2.2 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 800 B, 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 4.1 kB or 66% of the original size.

JavaScript Optimization

-38%

Potential reduce by 33.5 kB

  • Original 88.5 kB
  • After minification 88.5 kB
  • After compression 55.0 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 33.5 kB or 38% of the original size.

CSS Optimization

-36%

Potential reduce by 3.2 kB

  • Original 8.8 kB
  • After minification 8.8 kB
  • After compression 5.6 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. Register.clinicaltrials.gov needs all CSS files to be minified and compressed as it can save up to 3.2 kB or 36% of the original size.

Requests Breakdown

Number of requests can be reduced by 5 (38%)

Requests Now

13

After Optimization

8

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 13 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Register Clinical Trials. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

register.clinicaltrials.gov

register.clinicaltrials.gov

107 ms

register.clinicaltrials.gov

register.clinicaltrials.gov

52 ms

Script.js

Script.js

8 ms

data-entry.css

data-entry.css

19 ms

working.js

working.js

18 ms

pinger.js

pinger.js

51 ms

fda-left.gif

fda-left.gif

16 ms

autosuggest.css

autosuggest.css

7 ms

prs_angular.css

prs_angular.css

8 ms

working.gif

working.gif

29 ms

analytics.js

analytics.js

27 ms

gtm.js

gtm.js

51 ms

stat

stat

63 ms

collect

collect

25 ms

54 ms

Accessibility Review

register.clinicaltrials.gov accessibility score

76

Accessibility Issues

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

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

Form elements do not have associated labels

Best Practices

register.clinicaltrials.gov best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

register.clinicaltrials.gov SEO score

69

Search Engine Optimization Advices

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Register.clinicaltrials.gov can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Register.clinicaltrials.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

register.clinicaltrials.gov

Open Graph description is not detected on the main page of Register Clinical Trials. 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: