Tools & Wizards About Us

Report Summary

  • 10

    Performance

    Renders faster than
    23% of other websites

  • 38

    Accessibility

    Visual factors better than
    that of 19% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 83

    SEO

    Google-friendlier than
    46% of websites

diamondtrainingschool.co.za

Harry Oppenheimer Diamond Training School - Become a Diamond Expert

Page Load Speed

6.4 sec in total

First Response

764 ms

Resources Loaded

5.3 sec

Page Rendered

319 ms

About Website

Click here to check amazing Diamond Training School content for Russia. Otherwise, check out these important facts you probably never knew about diamondtrainingschool.co.za

Harry Oppenheimer Diamond Training School is a Non profit company that specialises in providing specialised training for the diamond manufacturing and rough diamond buying industry

Visit diamondtrainingschool.co.za

Key Findings

We analyzed Diamondtrainingschool.co.za page load time and found that the first response time was 764 ms and then it took 5.7 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

diamondtrainingschool.co.za performance score

10

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.7 s

2/100

10%

LCP (Largest Contentful Paint)

Value16.7 s

0/100

25%

SI (Speed Index)

Value19.9 s

0/100

10%

TBT (Total Blocking Time)

Value1,050 ms

25/100

30%

CLS (Cumulative Layout Shift)

Value0.637

9/100

15%

TTI (Time to Interactive)

Value15.8 s

6/100

10%

Network Requests Diagram

diamondtrainingschool.co.za

764 ms

diamondtrainingschool.co.za

1162 ms

gtm.js

97 ms

css

88 ms

bootstrap.min.css

305 ms

Our browser made a total of 69 requests to load all elements on the main page. We found that 80% of them (55 requests) were addressed to the original Diamondtrainingschool.co.za, 6% (4 requests) were made to Googletagmanager.com and 6% (4 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (2.3 sec) belongs to the original domain Diamondtrainingschool.co.za.

Page Optimization Overview & Recommendations

Page size can be reduced by 155.4 kB (17%)

Content Size

926.5 kB

After Optimization

771.1 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Diamondtrainingschool.co.za main page is 926.5 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. 45% of websites need less resources to load. Images take 533.9 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 34.3 kB

  • Original 42.7 kB
  • After minification 36.9 kB
  • After compression 8.4 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 5.8 kB, which is 14% 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 34.3 kB or 80% of the original size.

Image Optimization

-5%

Potential reduce by 27.0 kB

  • Original 533.9 kB
  • After minification 506.8 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. Diamond Training School images are well optimized though.

JavaScript Optimization

-24%

Potential reduce by 63.4 kB

  • Original 266.7 kB
  • After minification 266.6 kB
  • After compression 203.3 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 63.4 kB or 24% of the original size.

CSS Optimization

-37%

Potential reduce by 30.7 kB

  • Original 83.3 kB
  • After minification 83.3 kB
  • After compression 52.6 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. Diamondtrainingschool.co.za needs all CSS files to be minified and compressed as it can save up to 30.7 kB or 37% of the original size.

Requests Breakdown

Number of requests can be reduced by 40 (66%)

Requests Now

61

After Optimization

21

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 61 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Diamond Training School. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 28 to 1 for JavaScripts and from 14 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

diamondtrainingschool.co.za accessibility score

38

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

diamondtrainingschool.co.za best practices score

75

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

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

diamondtrainingschool.co.za SEO score

83

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

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Diamondtrainingschool.co.za 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 Diamondtrainingschool.co.za 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 Diamond Training School. 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: