Report Summary

  • 36

    Performance

    Renders faster than
    56% of other websites

  • 81

    Accessibility

    Visual factors better than
    that of 52% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    81% of websites

  • 78

    SEO

    Google-friendlier than
    40% of websites

chemistry.asu.edu

Home page | School of Molecular Sciences

Page Load Speed

3.2 sec in total

First Response

171 ms

Resources Loaded

2.2 sec

Page Rendered

837 ms

chemistry.asu.edu screenshot

About Website

Visit chemistry.asu.edu now to see the best up-to-date Chemistry Asu content for United States and also check out these interesting facts you probably never knew about chemistry.asu.edu

Visit chemistry.asu.edu

Key Findings

We analyzed Chemistry.asu.edu page load time and found that the first response time was 171 ms and then it took 3 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.

Performance Metrics

chemistry.asu.edu performance score

36

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.4 s

69/100

10%

LCP (Largest Contentful Paint)

Value20.8 s

0/100

25%

SI (Speed Index)

Value8.5 s

17/100

10%

TBT (Total Blocking Time)

Value740 ms

40/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value18.9 s

3/100

10%

Network Requests Diagram

chemistry.asu.edu

171 ms

sms.asu.edu

646 ms

asu_header.min.css

344 ms

asu_header.min.js

99 ms

system.base.css

92 ms

Our browser made a total of 167 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Chemistry.asu.edu, 96% (160 requests) were made to Sms.asu.edu and 1% (2 requests) were made to Asu.edu. The less responsive or slowest element that took the longest time to load (646 ms) relates to the external source Sms.asu.edu.

Page Optimization Overview & Recommendations

Page size can be reduced by 892.1 kB (30%)

Content Size

2.9 MB

After Optimization

2.0 MB

In fact, the total size of Chemistry.asu.edu main page is 2.9 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. 70% of websites need less resources to load. Images take 1.9 MB which makes up the majority of the site volume.

HTML Optimization

-76%

Potential reduce by 142.9 kB

  • Original 187.0 kB
  • After minification 174.8 kB
  • After compression 44.1 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. 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 142.9 kB or 76% of the original size.

Image Optimization

-7%

Potential reduce by 140.1 kB

  • Original 1.9 MB
  • After minification 1.8 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. Chemistry Asu images are well optimized though.

JavaScript Optimization

-64%

Potential reduce by 173.1 kB

  • Original 270.2 kB
  • After minification 243.7 kB
  • After compression 97.1 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 173.1 kB or 64% of the original size.

CSS Optimization

-81%

Potential reduce by 436.0 kB

  • Original 538.0 kB
  • After minification 457.9 kB
  • After compression 102.0 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.asu.edu needs all CSS files to be minified and compressed as it can save up to 436.0 kB or 81% of the original size.

Requests Breakdown

Number of requests can be reduced by 122 (77%)

Requests Now

159

After Optimization

37

The browser has sent 159 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Chemistry Asu. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 38 to 1 for JavaScripts and from 86 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

chemistry.asu.edu accessibility score

81

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

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

chemistry.asu.edu 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

Missing source maps for large first-party JavaScript

SEO Factors

chemistry.asu.edu SEO score

78

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

High

Links are not crawlable

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

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Chemistry.asu.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.asu.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 Asu. 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: