Tools & Wizards About Us
chem.usc.edu screenshot

Report Summary

  • 34

    Performance

    Renders faster than
    54% of other websites

  • 69

    Accessibility

    Visual factors better than
    that of 35% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 74

    SEO

    Google-friendlier than
    32% of websites

chem.usc.edu

Home - Department of Chemistry

Page Load Speed

2.5 sec in total

First Response

269 ms

Resources Loaded

2 sec

Page Rendered

246 ms

chem.usc.edu screenshot

About Website

Click here to check amazing Chem Usc content for United States. Otherwise, check out these important facts you probably never knew about chem.usc.edu

USC Dornsife Department of Chemistry

Visit chem.usc.edu

Key Findings

We analyzed Chem.usc.edu page load time and found that the first response time was 269 ms and then it took 2.3 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

chem.usc.edu performance score

34

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.6 s

13/100

10%

LCP (Largest Contentful Paint)

Value23.7 s

0/100

25%

SI (Speed Index)

Value8.7 s

16/100

10%

TBT (Total Blocking Time)

Value550 ms

53/100

30%

CLS (Cumulative Layout Shift)

Value0.053

98/100

15%

TTI (Time to Interactive)

Value20.5 s

2/100

10%

Network Requests Diagram

chem.usc.edu

269 ms

main2.css

81 ms

main2.js

145 ms

uscmark.png

82 ms

dornsife.png

73 ms

Our browser made a total of 24 requests to load all elements on the main page. We found that all of those requests were addressed to Chem.usc.edu and no external sources were called. The less responsive or slowest element that took the longest time to load (1.4 sec) belongs to the original domain Chem.usc.edu.

Page Optimization Overview & Recommendations

Page size can be reduced by 429.1 kB (9%)

Content Size

5.0 MB

After Optimization

4.6 MB

  • HTML
  • Images
  • CSS

In fact, the total size of Chem.usc.edu main page is 5.0 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. 25% of websites need less resources to load. Images take 5.0 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 19.7 kB

  • Original 24.4 kB
  • After minification 23.2 kB
  • After compression 4.7 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 19.7 kB or 81% of the original size.

Image Optimization

-8%

Potential reduce by 394.4 kB

  • Original 5.0 MB
  • After minification 4.6 MB

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. Chem Usc images are well optimized though.

CSS Optimization

-80%

Potential reduce by 15.0 kB

  • Original 18.8 kB
  • After minification 16.1 kB
  • After compression 3.8 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. Chem.usc.edu needs all CSS files to be minified and compressed as it can save up to 15.0 kB or 80% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

23

After Optimization

23

  • Images
  • JavaScript
  • CSS

The browser has sent 23 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Chem Usc. According to our analytics all requests are already optimized.

Network Requests Diagram

chem.usc.edu

chem.usc.edu

269 ms

main2.css

main2.css

81 ms

main2.js

main2.js

145 ms

uscmark.png

uscmark.png

82 ms

dornsife.png

dornsife.png

73 ms

smalllogo.png

smalllogo.png

142 ms

2.jpg

2.jpg

143 ms

3.jpg

3.jpg

146 ms

close-icon.png

close-icon.png

144 ms

5.jpg

5.jpg

146 ms

AboutUsfront.jpg

AboutUsfront.jpg

509 ms

button2.png

button2.png

212 ms

button1.png

button1.png

209 ms

p51.jpg

p51.jpg

212 ms

marinescu_melot.png

marinescu_melot.png

973 ms

dawlaty_melot.png

dawlaty_melot.png

1008 ms

icalb.png

icalb.png

277 ms

people.jpg

people.jpg

765 ms

graduatefront.jpg

graduatefront.jpg

1424 ms

undergrad.jpg

undergrad.jpg

692 ms

resources.jpg

resources.jpg

742 ms

classes.jpg

classes.jpg

901 ms

main_small.css

main_small.css

81 ms

main_medium.css

main_medium.css

82 ms

Accessibility Review

chem.usc.edu accessibility score

69

Accessibility Issues

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

chem.usc.edu 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

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

chem.usc.edu SEO score

74

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

High

Page is blocked from indexing

Content Best Practices

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

Impact

Issue

High

Image elements do not have [alt] attributes

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

    N/A

  • Encoding

    N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Chem.usc.edu 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 Chem.usc.edu main page’s claimed encoding is . Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

chem.usc.edu

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