Access chem-bio.info. IGCSE & A-levels Resources: notes, solved past papers and lectures

name

value

score

weighting

FCP (First Contentful Paint)

Value2.9 s

54/100

10%

LCP (Largest Contentful Paint)

Value10.9 s

0/100

25%

SI (Speed Index)

Value6.0 s

47/100

10%

TBT (Total Blocking Time)

Value630 ms

47/100

30%

CLS (Cumulative Layout Shift)

Value0.11

87/100

15%

TTI (Time to Interactive)

Value10.0 s

26/100

10%

chem-bio.info

311 ms

chem-bio.info

466 ms

www.chem-bio.info

767 ms

js

81 ms

gtm.js

199 ms

Our browser made a total of 39 requests to load all elements on the main page. We found that 21% of them (8 requests) were addressed to the original Chem-bio.info, 49% (19 requests) were made to Cdn.website-editor.net and 18% (7 requests) were made to Static-cdn.website-editor.net. The less responsive or slowest element that took the longest time to load (2.5 sec) relates to the external source Cdn.website-editor.net.

Content Size

495.4 kB

After Optimization

297.9 kB

In fact, the total size of Chem-bio.info main page is 495.4 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. 40% of websites need less resources to load. HTML takes 260.5 kB which makes up the majority of the site volume.

HTML Optimization

-75%

Potential reduce by 196.4 kB

Original 260.5 kB
After minification 254.2 kB
After compression 64.1 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 196.4 kB or 75% of the original size.

Image Optimization

-1%

Potential reduce by 69 B

Original 7.4 kB
After minification 7.3 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. Chem Bio images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 444 B

Original 141.6 kB
After minification 141.6 kB
After compression 141.1 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. This website has mostly compressed JavaScripts.

CSS Optimization

-1%

Potential reduce by 575 B

Original 85.9 kB
After minification 85.9 kB
After compression 85.4 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-bio.info has all CSS files already compressed.

Requests Now

After Optimization

The browser has sent 31 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Chem Bio. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

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.

High

[aria-hidden="true"] elements contain focusable descendents

These are opportunities to improve keyboard navigation in your application.

High

Heading elements are not in a sequentially-descending order

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.

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

High

Displays images with incorrect aspect ratio

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

Search Engine Optimization Advices

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

High

Links do not have descriptive text

High

Image elements do not have [alt] attributes

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

High

Links are not crawlable

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/).

High

Document uses legible font sizes

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 Chem-bio.info 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 Chem-bio.info 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

chem-bio.info

Open Graph data is detected on the main page of Chem Bio. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook:

Report Summary

Performance

Accessibility

Best Practices

SEO

IGCSE & A-levels Resources: notes, solved past papers and lectures

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

chem-bio.info

chem-bio.info

www.chem-bio.info

js

gtm.js

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

chem-bio.info

chem-bio.info

www.chem-bio.info

js

gtm.js

favicon+chem-bio-60w.png

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improve+your+ums+ial+biology+chemistry.webp

ial+chemistry+solved+past+papers+.webp

igcse+biology+chemistry+notes+solved+past+papers.webp

igcse+a-level+courses.webp

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igcse+ial+notes+solved+past+papers.webp

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IAL+Biology+Notes+2024.webp

ial+chemistry+notes+solved+past+papers.webp

igcse+biology+chemistry+revision.webp

whatsapp_layout_5.svg

css2

d-css-runtime-desktop-one-package-structured-global.min.css

198f2b6c759f9eeacdaf38c93c24c0cc.css

561c2958e6664f6d9e3c1816539011e5_withFlex_1.min.css

1and1-runtime.css

561c2958e6664f6d9e3c1816539011e5_home_withFlex_1.min.css

jquery.min.js

d-js-one-runtime-unified-desktop.min.js

popup.js

helpers.js

userVisitsConditionService.js

timeRangeConditionService.js

rrule.min.js

fontawesome-webfont.woff

igcse+biology+chemistry+revision.webp

dm-social-icons.ttf

dm-common-icons.ttf

Accessibility Review

Accessibility Issues

Best Practices

Areas of Improvement