Tools & Wizards About Us
chemistryscl.com screenshot

Report Summary

  • 54

    Performance

    Renders faster than
    71% of other websites

  • 79

    Accessibility

    Visual factors better than
    that of 47% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 88

    SEO

    Google-friendlier than
    65% of websites

chemistryscl.com

Learn Chemistry High School, Advanced Level, Chemical Engineering

Page Load Speed

1.8 sec in total

First Response

400 ms

Resources Loaded

990 ms

Page Rendered

393 ms

chemistryscl.com screenshot

About Website

Click here to check amazing Chemistry Scl content for United States. Otherwise, check out these important facts you probably never knew about chemistryscl.com

Learn High school chemistry, ordinary level chemistry, chemical engineering and all chemistry free. You can ask questions from our staff. We provide you papers to practise before exams. Find reactions...

Visit chemistryscl.com

Key Findings

We analyzed Chemistryscl.com page load time and found that the first response time was 400 ms and then it took 1.4 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

chemistryscl.com performance score

54

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.1 s

46/100

10%

LCP (Largest Contentful Paint)

Value4.8 s

31/100

25%

SI (Speed Index)

Value4.0 s

81/100

10%

TBT (Total Blocking Time)

Value320 ms

76/100

30%

CLS (Cumulative Layout Shift)

Value0.299

40/100

15%

TTI (Time to Interactive)

Value7.9 s

44/100

10%

Network Requests Diagram

chemistryscl.com

400 ms

www.chemistryscl.com

160 ms

gppstub.js

135 ms

boise.js

90 ms

abilene.js

133 ms

Our browser made a total of 23 requests to load all elements on the main page. We found that 13% of them (3 requests) were addressed to the original Chemistryscl.com, 26% (6 requests) were made to Google.com and 17% (4 requests) were made to Ezojs.com. The less responsive or slowest element that took the longest time to load (400 ms) belongs to the original domain Chemistryscl.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 48.3 kB (13%)

Content Size

373.7 kB

After Optimization

325.3 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Chemistryscl.com main page is 373.7 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. 50% of websites need less resources to load. Javascripts take 211.6 kB which makes up the majority of the site volume.

HTML Optimization

-73%

Potential reduce by 40.8 kB

  • Original 55.8 kB
  • After minification 55.8 kB
  • After compression 15.0 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 40.8 kB or 73% of the original size.

Image Optimization

-3%

Potential reduce by 3.1 kB

  • Original 95.6 kB
  • After minification 92.6 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. Chemistry Scl images are well optimized though.

JavaScript Optimization

-1%

Potential reduce by 1.1 kB

  • Original 211.6 kB
  • After minification 211.6 kB
  • After compression 210.5 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

-31%

Potential reduce by 3.3 kB

  • Original 10.6 kB
  • After minification 10.6 kB
  • After compression 7.3 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. Chemistryscl.com needs all CSS files to be minified and compressed as it can save up to 3.3 kB or 31% of the original size.

Requests Breakdown

Number of requests can be reduced by 11 (58%)

Requests Now

19

After Optimization

8

  • Images
  • JavaScript
  • CSS

The browser has sent 19 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Chemistry Scl. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

chemistryscl.com

chemistryscl.com

400 ms

www.chemistryscl.com

www.chemistryscl.com

160 ms

gppstub.js

gppstub.js

135 ms

boise.js

boise.js

90 ms

abilene.js

abilene.js

133 ms

tulsa.js

tulsa.js

163 ms

js

js

139 ms

bootstrap.min.css

bootstrap.min.css

85 ms

jquery.min.js

jquery.min.js

59 ms

bootstrap.min.js

bootstrap.min.js

122 ms

ccpaplus.js

ccpaplus.js

122 ms

lazy_load.js

lazy_load.js

48 ms

cse.js

cse.js

80 ms

back.jpg

back.jpg

224 ms

cse_element__en.js

cse_element__en.js

35 ms

default+en.css

default+en.css

128 ms

shiny.css

shiny.css

130 ms

async-ads.js

async-ads.js

72 ms

cse_theme_shiny_form_bg.png

cse_theme_shiny_form_bg.png

30 ms

clear.png

clear.png

30 ms

nav_logo114.png

nav_logo114.png

39 ms

glyphicons-halflings-regular.woff

glyphicons-halflings-regular.woff

36 ms

cse_theme_shiny_form_bg.png

cse_theme_shiny_form_bg.png

12 ms

Accessibility Review

chemistryscl.com accessibility score

79

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

Buttons do not have an accessible name

High

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

High

Image elements do not have [alt] attributes

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

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

Best Practices

chemistryscl.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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

chemistryscl.com SEO score

88

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

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 Chemistryscl.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 Chemistryscl.com 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

chemistryscl.com

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