Report Summary

  • 30

    Performance

    Renders faster than
    50% of other websites

  • 69

    Accessibility

    Visual factors better than
    that of 35% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 86

    SEO

    Google-friendlier than
    60% of websites

sja.org.uk

First Aid Courses, Advice & Volunteering | St John Ambulance

Page Load Speed

2.8 sec in total

First Response

335 ms

Resources Loaded

2.3 sec

Page Rendered

207 ms

sja.org.uk screenshot

About Website

Visit sja.org.uk now to see the best up-to-date Sja content for United Kingdom and also check out these interesting facts you probably never knew about sja.org.uk

As the nation's leading first aid charity, St John Ambulance offers training courses, advice, volunteering opportunities, event support, products and more.

Visit sja.org.uk

Key Findings

We analyzed Sja.org.uk page load time and found that the first response time was 335 ms and then it took 2.5 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.

Performance Metrics

sja.org.uk performance score

30

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.5 s

14/100

10%

LCP (Largest Contentful Paint)

Value8.4 s

2/100

25%

SI (Speed Index)

Value6.7 s

36/100

10%

TBT (Total Blocking Time)

Value1,290 ms

18/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value8.3 s

40/100

10%

Network Requests Diagram

sja.org.uk

335 ms

default.aspx

343 ms

WebResource.axd

153 ms

slick.css

11 ms

bootstrap.min.css

305 ms

Our browser made a total of 95 requests to load all elements on the main page. We found that 49% of them (47 requests) were addressed to the original Sja.org.uk, 7% (7 requests) were made to Apis.google.com and 3% (3 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (632 ms) relates to the external source Static.xx.fbcdn.net.

Page Optimization Overview & Recommendations

Page size can be reduced by 627.7 kB (61%)

Content Size

1.0 MB

After Optimization

393.9 kB

In fact, the total size of Sja.org.uk main page is 1.0 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. 55% of websites need less resources to load. CSS take 402.3 kB which makes up the majority of the site volume.

HTML Optimization

-76%

Potential reduce by 47.1 kB

  • Original 62.4 kB
  • After minification 57.8 kB
  • After compression 15.3 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 47.1 kB or 76% of the original size.

Image Optimization

-11%

Potential reduce by 23.8 kB

  • Original 208.4 kB
  • After minification 184.6 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. Obviously, Sja needs image optimization as it can save up to 23.8 kB or 11% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-64%

Potential reduce by 221.4 kB

  • Original 348.5 kB
  • After minification 340.9 kB
  • After compression 127.1 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 221.4 kB or 64% of the original size.

CSS Optimization

-83%

Potential reduce by 335.4 kB

  • Original 402.3 kB
  • After minification 385.0 kB
  • After compression 67.0 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. Sja.org.uk needs all CSS files to be minified and compressed as it can save up to 335.4 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 36 (41%)

Requests Now

88

After Optimization

52

The browser has sent 88 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Sja. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 31 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

sja.org.uk accessibility score

69

Accessibility Issues

ARIA

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.

Impact

Issue

High

Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.

High

[role]s are not contained by their required parent element

High

[role] values are not valid

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Links do not have a discernible name

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

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

sja.org.uk best practices score

83

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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

sja.org.uk SEO score

86

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

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Sja.org.uk 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 Sja.org.uk 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

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