Tools & Wizards About Us

Report Summary

  • 72

    Performance

    Renders faster than
    82% of other websites

  • 55

    Accessibility

    Visual factors better than
    that of 23% of websites

  • 50

    Best Practices

    More advanced features
    available than in
    19% of websites

  • 67

    SEO

    Google-friendlier than
    26% of websites

periodictable.com

The Photographic Periodic Table of the Elements

Page Load Speed

916 ms in total

First Response

113 ms

Resources Loaded

643 ms

Page Rendered

160 ms

About Website

Visit periodictable.com now to see the best up-to-date Periodic Table content for India and also check out these interesting facts you probably never knew about periodictable.com

The definitive online periodic table reference site including technical data, and photographs and descriptions of thousands of samples of the chemical elements.

Visit periodictable.com

Key Findings

We analyzed Periodictable.com page load time and found that the first response time was 113 ms and then it took 803 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.

Performance Metrics

periodictable.com performance score

72

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.8 s

57/100

10%

LCP (Largest Contentful Paint)

Value4.5 s

36/100

25%

SI (Speed Index)

Value7.2 s

29/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.011

100/100

15%

TTI (Time to Interactive)

Value2.8 s

97/100

10%

Network Requests Diagram

periodictable.com

113 ms

periodictable.com

230 ms

periodictable.com.banner.png

87 ms

Perspective.233.JPG

113 ms

1.JPG

324 ms

Our browser made a total of 14 requests to load all elements on the main page. We found that 64% of them (9 requests) were addressed to the original Periodictable.com, 14% (2 requests) were made to Google.com and 7% (1 request) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (324 ms) belongs to the original domain Periodictable.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 58.0 kB (14%)

Content Size

422.9 kB

After Optimization

365.0 kB

  • HTML
  • Images
  • JavaScript

In fact, the total size of Periodictable.com main page is 422.9 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. 15% of websites need less resources to load. Images take 375.2 kB which makes up the majority of the site volume.

HTML Optimization

-89%

Potential reduce by 31.2 kB

  • Original 35.0 kB
  • After minification 34.9 kB
  • After compression 3.8 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 31.2 kB or 89% of the original size.

Image Optimization

-7%

Potential reduce by 25.6 kB

  • Original 375.2 kB
  • After minification 349.6 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. Periodic Table images are well optimized though.

JavaScript Optimization

-9%

Potential reduce by 1.1 kB

  • Original 12.7 kB
  • After minification 12.7 kB
  • After compression 11.5 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.

Requests Breakdown

We found no issues to fix!

Requests Now

11

After Optimization

11

  • Images
  • JavaScript

The browser has sent 11 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Periodic Table. According to our analytics all requests are already optimized.

Network Requests Diagram

Accessibility Review

periodictable.com accessibility score

55

Accessibility Issues

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

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

Form elements do not have associated labels

Best Practices

periodictable.com best practices score

50

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

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

High

Browser errors were logged to the console

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

periodictable.com SEO score

67

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

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 Periodictable.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 Periodictable.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

Open Graph description is not detected on the main page of Periodic Table. 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: