Report Summary

  • 42

    Performance

    Renders faster than
    61% of other websites

  • 87

    Accessibility

    Visual factors better than
    that of 67% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 81

    SEO

    Google-friendlier than
    43% of websites

chemistry.cua.edu

Chemistry - School of Arts and Sciences - Catholic University, Washington, DC | CUA

Page Load Speed

1.9 sec in total

First Response

313 ms

Resources Loaded

1.2 sec

Page Rendered

413 ms

chemistry.cua.edu screenshot

About Website

Click here to check amazing Chemistry CUA content for United States. Otherwise, check out these important facts you probably never knew about chemistry.cua.edu

The Department of Chemistry at The Catholic University of America is dedicated to excellence in undergraduate education and research.

Visit chemistry.cua.edu

Key Findings

We analyzed Chemistry.cua.edu page load time and found that the first response time was 313 ms and then it took 1.6 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 30% of websites can load faster.

Performance Metrics

chemistry.cua.edu performance score

42

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.9 s

53/100

10%

LCP (Largest Contentful Paint)

Value10.1 s

0/100

25%

SI (Speed Index)

Value4.1 s

79/100

10%

TBT (Total Blocking Time)

Value720 ms

41/100

30%

CLS (Cumulative Layout Shift)

Value0.102

89/100

15%

TTI (Time to Interactive)

Value9.9 s

27/100

10%

Network Requests Diagram

chemistry.cua.edu

313 ms

reset-fonts.css

21 ms

base-min.css

22 ms

core.css

23 ms

theme.css

22 ms

Our browser made a total of 46 requests to load all elements on the main page. We found that 30% of them (14 requests) were addressed to the original Chemistry.cua.edu, 43% (20 requests) were made to Cua.edu and 7% (3 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (448 ms) relates to the external source Cua.edu.

Page Optimization Overview & Recommendations

Page size can be reduced by 86.5 kB (29%)

Content Size

303.2 kB

After Optimization

216.7 kB

In fact, the total size of Chemistry.cua.edu main page is 303.2 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. 55% of websites need less resources to load. Images take 199.6 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 26.2 kB

  • Original 33.3 kB
  • After minification 26.8 kB
  • After compression 7.1 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 6.5 kB, which is 20% 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 26.2 kB or 79% of the original size.

Image Optimization

-15%

Potential reduce by 30.0 kB

  • Original 199.6 kB
  • After minification 169.6 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. Obviously, Chemistry CUA needs image optimization as it can save up to 30.0 kB or 15% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-5%

Potential reduce by 1.6 kB

  • Original 33.3 kB
  • After minification 33.3 kB
  • After compression 31.7 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

-78%

Potential reduce by 28.7 kB

  • Original 37.0 kB
  • After minification 27.8 kB
  • After compression 8.3 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. Chemistry.cua.edu needs all CSS files to be minified and compressed as it can save up to 28.7 kB or 78% of the original size.

Requests Breakdown

Number of requests can be reduced by 25 (56%)

Requests Now

45

After Optimization

20

The browser has sent 45 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Chemistry CUA. 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 from 10 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

chemistry.cua.edu accessibility score

87

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

[aria-*] attributes do not have valid values

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

Best Practices

chemistry.cua.edu best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

chemistry.cua.edu SEO score

81

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

Crawling and Indexing

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

Impact

Issue

High

Links are not crawlable

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 Chemistry.cua.edu 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 Chemistry.cua.edu 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

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