Report Summary

  • 19

    Performance

    Renders faster than
    36% of other websites

  • 80

    Accessibility

    Visual factors better than
    that of 49% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 79

    SEO

    Google-friendlier than
    40% of websites

colas.co.uk

Colas UK Infrastructure Contractor | Highway & Airport Contractor

Page Load Speed

2.8 sec in total

First Response

316 ms

Resources Loaded

1.8 sec

Page Rendered

621 ms

colas.co.uk screenshot

About Website

Click here to check amazing Colas content for United Kingdom. Otherwise, check out these important facts you probably never knew about colas.co.uk

Colas UK Infrastructure Contractor: We design, construct and maintain highway, aviation and defence infrastructure projects across the UK and Internationally.

Visit colas.co.uk

Key Findings

We analyzed Colas.co.uk page load time and found that the first response time was 316 ms and then it took 2.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Performance Metrics

colas.co.uk performance score

19

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.8 s

11/100

10%

LCP (Largest Contentful Paint)

Value10.8 s

0/100

25%

SI (Speed Index)

Value12.0 s

4/100

10%

TBT (Total Blocking Time)

Value1,950 ms

8/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value25.4 s

0/100

10%

Network Requests Diagram

colas.co.uk

316 ms

css

55 ms

css

73 ms

c0edd068ad.js

114 ms

bootstrap.min.css

467 ms

Our browser made a total of 77 requests to load all elements on the main page. We found that 53% of them (41 requests) were addressed to the original Colas.co.uk, 6% (5 requests) were made to Use.fontawesome.com and 6% (5 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (1.1 sec) belongs to the original domain Colas.co.uk.

Page Optimization Overview & Recommendations

Page size can be reduced by 643.7 kB (13%)

Content Size

5.0 MB

After Optimization

4.3 MB

In fact, the total size of Colas.co.uk main page is 5.0 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. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 3.8 MB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 90.9 kB

  • Original 107.5 kB
  • After minification 91.9 kB
  • After compression 16.6 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 15.7 kB, which is 15% 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 90.9 kB or 85% of the original size.

Image Optimization

-0%

Potential reduce by 11.6 kB

  • Original 3.8 MB
  • After minification 3.8 MB

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. Colas images are well optimized though.

JavaScript Optimization

-44%

Potential reduce by 317.1 kB

  • Original 725.0 kB
  • After minification 713.7 kB
  • After compression 407.9 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 317.1 kB or 44% of the original size.

CSS Optimization

-68%

Potential reduce by 224.1 kB

  • Original 330.4 kB
  • After minification 292.5 kB
  • After compression 106.4 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. Colas.co.uk needs all CSS files to be minified and compressed as it can save up to 224.1 kB or 68% of the original size.

Requests Breakdown

Number of requests can be reduced by 42 (63%)

Requests Now

67

After Optimization

25

The browser has sent 67 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Colas. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 26 to 1 for JavaScripts and from 11 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

colas.co.uk accessibility score

80

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

ARIA input fields do not have accessible names

High

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

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

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

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

colas.co.uk best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

colas.co.uk SEO score

79

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

High

Image elements do not have [alt] attributes

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

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Colas.co.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 Colas.co.uk 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 data is detected on the main page of Colas. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: