Tools & Wizards About Us
q-chem.com screenshot

Report Summary

  • 16

    Performance

    Renders faster than
    30% of other websites

  • 98

    Accessibility

    Visual factors better than
    that of 94% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 80

    SEO

    Google-friendlier than
    42% of websites

q-chem.com

Q-Chem 6.2 | Fast, Accurate, Robust Chemistry Simulations | Q-Chem

Page Load Speed

1.9 sec in total

First Response

139 ms

Resources Loaded

1.2 sec

Page Rendered

579 ms

q-chem.com screenshot

About Website

Visit q-chem.com now to see the best up-to-date Q Chem content for United States and also check out these interesting facts you probably never knew about q-chem.com

Q-Chem: Chemistry software, theoretical chemistry and quantum chemistry software for research, visualization, quantum calculation and molecular modeling

Visit q-chem.com

Key Findings

We analyzed Q-chem.com page load time and found that the first response time was 139 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

q-chem.com performance score

16

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.1 s

45/100

10%

LCP (Largest Contentful Paint)

Value13.3 s

0/100

25%

SI (Speed Index)

Value6.2 s

44/100

10%

TBT (Total Blocking Time)

Value16,930 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.258

48/100

15%

TTI (Time to Interactive)

Value27.4 s

0/100

10%

Network Requests Diagram

q-chem.com

139 ms

stylesheetContent.css

67 ms

jquery.min.js

30 ms

in.js

93 ms

ga.js

54 ms

Our browser made a total of 49 requests to load all elements on the main page. We found that 76% of them (37 requests) were addressed to the original Q-chem.com, 4% (2 requests) were made to Platform.linkedin.com and 4% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (944 ms) belongs to the original domain Q-chem.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 604.7 kB (15%)

Content Size

4.1 MB

After Optimization

3.5 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Q-chem.com main page is 4.1 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. 40% of websites need less resources to load. Images take 4.1 MB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 20.5 kB

  • Original 26.6 kB
  • After minification 18.6 kB
  • After compression 6.1 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 8.0 kB, which is 30% 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 20.5 kB or 77% of the original size.

Image Optimization

-14%

Potential reduce by 577.1 kB

  • Original 4.1 MB
  • After minification 3.5 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. Obviously, Q Chem needs image optimization as it can save up to 577.1 kB or 14% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-1%

Potential reduce by 181 B

  • Original 17.4 kB
  • After minification 17.3 kB
  • After compression 17.2 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 6.9 kB

  • Original 8.8 kB
  • After minification 7.1 kB
  • After compression 1.9 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. Q-chem.com needs all CSS files to be minified and compressed as it can save up to 6.9 kB or 78% of the original size.

Requests Breakdown

Number of requests can be reduced by 6 (13%)

Requests Now

48

After Optimization

42

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 48 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Q Chem. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 7 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

q-chem.com

q-chem.com

139 ms

stylesheetContent.css

stylesheetContent.css

67 ms

jquery.min.js

jquery.min.js

30 ms

in.js

in.js

93 ms

ga.js

ga.js

54 ms

all.js

all.js

18 ms

widgets.js

widgets.js

130 ms

content_bkgd1.jpg

content_bkgd1.jpg

52 ms

QChemBanner.png

QChemBanner.png

125 ms

nav_normal.jpg

nav_normal.jpg

97 ms

FreeEval%20Btn_Up2.gif

FreeEval%20Btn_Up2.gif

124 ms

Find-us-on-facebook_logo.gif

Find-us-on-facebook_logo.gif

135 ms

LinkedIn%20Logo.png

LinkedIn%20Logo.png

98 ms

iOpenShell.PNG

iOpenShell.PNG

131 ms

Qchem%204-3%20MANUAL.png

Qchem%204-3%20MANUAL.png

353 ms

ccl.PNG

ccl.PNG

135 ms

IQmol%20Logosmall.png

IQmol%20Logosmall.png

233 ms

Spartan14small.png

Spartan14small.png

233 ms

Video%20of%20the%20Week%20banner22.png

Video%20of%20the%20Week%20banner22.png

292 ms

12-Crown-4.png

12-Crown-4.png

521 ms

Spartan14.png

Spartan14.png

290 ms

SLIDE1.png

SLIDE1.png

398 ms

SLIDE2.png

SLIDE2.png

387 ms

SLIDE3.png

SLIDE3.png

457 ms

SLIDE4.png

SLIDE4.png

454 ms

SLIDE5.png

SLIDE5.png

514 ms

SLIDE6.png

SLIDE6.png

554 ms

SLIDE7.png

SLIDE7.png

561 ms

SLIDE8.png

SLIDE8.png

628 ms

SLIDE9.png

SLIDE9.png

619 ms

SLIDE10.png

SLIDE10.png

671 ms

SLIDE12.png

SLIDE12.png

681 ms

SLIDE13.png

SLIDE13.png

751 ms

SLIDE14.png

SLIDE14.png

769 ms

SLIDE15.png

SLIDE15.png

779 ms

SLIDE16.png

SLIDE16.png

783 ms

SLIDE17.png

SLIDE17.png

835 ms

SLIDE18.png

SLIDE18.png

836 ms

SLIDE19.png

SLIDE19.png

905 ms

SLIDE20.png

SLIDE20.png

925 ms

SLIDE21.png

SLIDE21.png

929 ms

SLIDE22.png

SLIDE22.png

944 ms

secureAnonymousFramework

secureAnonymousFramework

205 ms

salog.js.aspx

salog.js.aspx

88 ms

238 ms

__utm.gif

__utm.gif

25 ms

xd_arbiter.php

xd_arbiter.php

19 ms

xd_arbiter.php

xd_arbiter.php

25 ms

155734.js

155734.js

65 ms

Accessibility Review

q-chem.com accessibility score

98

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

Best Practices

q-chem.com best practices score

67

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

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

q-chem.com SEO score

80

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

    N/A

  • Encoding

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Q-chem.com 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 Q-chem.com main page’s claimed encoding is iso-8859-1. 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

q-chem.com

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